I
IMPET - IMPROM

IMPETUOSITY - nouns
• EAGERNESS † impetuosity, fierceness ...c1400
• FAIRD † motion, rush, impetus; hence, impetuosity, ardour; a violent onset ...1513 Sc.
• FARD † motion, rush, impetus; hence, impetuosity, ardour; a violent onset ...1513 Sc.
• FOUGUE † fury, passion; ardour, impetuosity ...1660 
• RANDOM † impetuosity, great speed, force, or violence in riding, running, striking, etc. ...c1305
• VIR vigour, energy, activity, briskness, gusto, force, impetuosity ...1738 Sc.
• VIRR vigour, energy, briskness, gusto, force, impetuosity ...1738 Sc.
• YEVERNESS † eagerness, impetuosity ...c1400 obs. exc. Sc.

IMPETUOUS - adjectives
• BORN-HEAD furious, impetuous ...Bk1911 Sc.
• BRAIN-MAD determined; keenly bent on; hurried on with the greatest impetuosity ...Bk1911 Sc.
• BRAIN-WUD mad; acting with fury or intense impetuosity ...Bk1911 Sc.
• EAGER strenuous, ardent, impetuous; fierce, angry, furious ...1297 obs. exc. Eng. dial.
• HAMMER-GLAMMER rash, impetuous, extremely impulsive and headstrong in behaviour ...1929 Sc.
• HEADY headstrong, impetuous, violent, self-willed, persistent ...1871 Sc. & Eng. dial.
• HEIDIE headstrong, impetuous, violent, self-willed, persistent ...1871 Sc.
• HEIDY headstrong, impetuous, violent, self-willed, persistent ...1871 Sc.
• IMPERIOUS impetuous ...Bk1902 Eng. dial.
• LAVISH † of conduct or disposition: unrestrained, impetuous; loose, wild, licentious ...1597
• MAINLESS impatient, restive, impetuous ...1880 Sc.
• OVERITIOUS boisterous, violent, headstrong, impetuous ...B1900 Sc.
• QUICK ON THE DRAW impetuous ...L19 sl.
• RACKLE † hasty, rash, reckless, impetuous, headstrong; rough or coarse in action; violent ...a1300 obs. exc. Sc. & N. Eng. dial.
• RAMBLESOME hot-headed, impetuous, blundering ...1864 Sc.
• RAMMELSOME hot-headed, impetuous, blundering ...1864 Sc.
• RAMMISH † of persons or animals: headstrong, impetuous, rash, uncontrolled, wanton ...1607 obs. exc. Sc. & Eng. dial.
• RAM-RACE headstrong, precipitate, impetuous ...1900 Sc.
• RAM-STAM precipitate, headstrong, hasty, impetuous, reckless ...1786 Sc. & N. Eng. dial.
• RANK having great speed or force; swift; impetuous; violent ...a1225
• RASE-BRAINED impetuous, harebrained, wild, violent ...1887 Eng, dial.
• RASH active, vigorous; brisk, hale, hearty, nimble, quick; eager, impetuous ...a1300 Sc. & N. Eng. dial.
• RASHFUL * rash, hasty, impetuous, reckless ...1567
• REDE fierce, impetuous, wild; excited; drunk ...1843 Sc.
• SPLEENY impetuous, fiery, irritable, ill-tempered ...1604
• SUDDEN † of persons: acting without forethought or deliberation; hasty, impetuous, rash ...c1374 obs. or arch.
• SULPHURIOUS † impetuous ...1599
• SULPHUROUS impetuous, fiery, heated ...1611
• THRUSTY hasty, impetuous ...Bk1905 Eng. dial.
• WANTON † of physical movement: headlong, impetuous, unrestrained ...1753
• YEVEROUS † eager, zealously enthusiastic, impetuous ...c1400
impetuous - person
• BERGE one who is impetuous in talk ...1925 Sc.
• HOTHEAD an impetuous person ...Bk1913-17 Amer. dial.
• RAM a headstrong, impetuous, blundering person ...1812 Sc.
• RAMAGIECHAN a big, raw-boned, awkward, impetuous person ...1808 Sc.
• RAMSTAM a giddy, forward, impetuous, reckless person ...1823 Sc.
• TEAR-AWAY one who tears or rushes away, or acts with great impetuosity; one who behaves in a wild, uncontrolled, or reckless manner; a rebellious and unruly young person; an uncontrollable, boisterous person; a rascal ...1891
• WARM HEAD † a warm-headed, excitable, impetuous person ...1684
• YOUNG-BLOOD † a 'young-blooded' person; a young hothead; a rash, reckless, or impetuous person ...1630
impetuous - verbs 
• BRANGE to dash forward impetuously ...Bk1911 Sc.
• HABBER-GLABBER rash, impetuous, extremely impulsive and headstrong in behaviour ...1929 Sc.
 
IMPETUOUSLY - adverbs
• BORN-HEAD straightforward, impetuously, headlong ...Bk1911 Sc.
• COFLY † impetuously, quickly ...c1000
• HEADILY headlong, precipitately, hastily, rashly; violently, impetuously ...c1450
• HEADLY † in a heady manner; impetuously, precipitately; headily ...1388
• HEAD UP in a lively, impetuous, or determined manner ...1854 Amer. dial.
• HEAD UP AND TAIL UP in a lively, impetuous, or determined manner ...1854 Amer. dial.
• LIKE A WHIRLYGUST IN A TEACUP headlong; impetuously ...2006 Amer. dial.
• NECK-BREAK in a break-neck or headlong manner; impetuously ...1631
• NECK OR NOUGHT impetuously; at headlong speed ...Bk1905 Eng. dial.
• RACKLY †* rapidly, impetuously ...c1470 Sc.
• TICKLE-BUT headlong, impetuously ...1874 Eng. dial.

IMPETUOUSNESS - nouns
• ELAN ardour; zeal; enthusiasm; impetuousness, vivacity ...1880 

IMPETUS - nouns
• BELLUM a blast, as of wind; force, impetus ...Bk1898 Sc. & Eng. dial.
• BENSEL strong bent or determination; impetus of a body in motion ...1513 Sc. & N. Eng. dial.
• BENT † impetus, concentrated energy ...1581
• BIR force, impetus ...Bk1911 Sc. 
• BIRR force, impetus, energy; violence; passion ...Bk1911 Sc. 
• FAIRD † motion, rush, impetus; hence, impetuosity, ardour; a violent onset ...1513 Sc.
• FARD † motion, rush, impetus; hence, impetuosity, ardour; a violent onset ...1513 Sc.
• IMPET †* impetus ...c1440
• RADEUR †* rapidity, impetus, force ...c1477
• RADOUR †* rapidity, impetus, force ...c1477
• VAIGE an impetus; a rush; a short run before taking a leap ...1842 Eng. dial.
• VAYGE an impetus; a rush; a short run before taking a leap ...1842 Eng. dial.
• VEASE † a rush, impetus; a run before a leap ...c1386 obs. exc. Eng. dial.
• VEGE an impetus; a rush; a short run before taking a leap ...1842 Eng. dial.
 
IMPINGING - adjectives
• IMPINGENT * impinging ...1759
 
IMPISH - see IMP

IMPLANTED - adjectives
• IMPLANTATE †* implanted ...1650
 
IMPLEMENT - nouns
• TANKLEMENTS implements; litter; small ornaments; articles of finery ...Bk1905 Eng. dial.
• TANKLIMENTS implements; litter; small ornaments; articles of finery ...Bk1905 Eng. dial.
 
IMPLICATE - adjectives
• IMPLICATIVE tending to imply or implicate ...1602
implicate - verbs 
• IMPLIFY to implicate ...Bk1902 Eng. dial.
• LAP † to involve; to imply, to include; to implicate, to entangle ...a1340
• RING IN to quote; to implicate ...Bk1903 Amer. sl.
 
IMPLICATION - adverbs
• IMPLICATELY † by implication ...c1555
• IMPLICATIVELY by implication ...1579
implication - nouns
• IMPLIAL * an act of implying; implication ...1846
• IMPLIANCE †* the act of implying; implication ...1677
• IMPLOYMENT †* implication, entanglement ...1598
• SUBINTELLIGENCE * an implication ...1630
 
IMPLIED - nouns
• IMPLICATE that which is implied or involved ...1881
 
IMPLORATION - nouns
• IMPLORE †* an act of imploring; imploration, entreaty ...1590
• IMPLOREMENT †* imploration ...1611
 
IMPLORE - person
• IMPLORATOR †* one who implores or supplicates ...1602
implore - verbs 
• HALSE † to call upon in the name of something divine or holy; to implore, to entreat, to beseech ...c825
• WADDY to beg, to implore ...L19 Aust. sl.
 
IMPLORING - adjectives
• IMPLORATORY * of imploring or beseeching nature ...1832
 
IMPLY - adjectives
• IMPLICATIVE tending to imply or implicate ...1602
imply - nouns 
• IMPLICATIVE †* that which implies; a statement or writing implying something more than it expressly states ...1589
imply - verbs 
• LAP † to involve; to imply, to include; to implicate, to entangle ...a1340
 
IMPLYING - adjectives
• SUBINTELLIGENTIAL * implying something beyond what is expressed ...1887
 
IMPOLITE - adjectives
• ASSY mean; malicious; stubborn; impolite; sarcastic; debased ...1980s sl.
• DISPERLITE impolite, rude ...1883 Amer. dial.
• MANGE unpleasant, impolite ...1990s W. Indies sl.
• NO-MANNERS ill-mannered; rude, impolite, unmannerly ...1922 Amer. dial.
• TACKEY uncouth, ill-mannered; impolite in behaviour ...1916 Amer. sl.
• TACKY uncouth, ill-mannered; impolite in behaviour ...1916 Amer. sl.
 
IMPOLITENESS - nouns
• INDISCRETION † incivility, impoliteness ...1721 Sc.
• NO-MANNERS lack of manners; rudeness; impoliteness ...1922 Amer. dial.
 
IMPORTANCE, IMPORTANT - adjectives
• BIG great, important; of high position or standing ...1597 colloq.
• BIGASS big, important, or overly important ...1955 US sl.
• BIG-BORE important ...Bk1942 Amer. sl.
• BIG BOUT YAH of a person: important ...1980s W. Indies usage
• BIG-BUGGISH important, self-important ...1843 Amer. dial.
• BIGGIE important ...Bk1942 Amer. sl.
• BIGGITY conceited, vain, self-important; impudent, boastful ...1880 Amer. dial.
• BIG-LEAGUE powerful, influential, important ...1919 US sl.
• BIG-NAME famous, important ...Bk2006 US sl.
• BIG-SHOT mighty; overbearing; overly important ...Bk2006 US sl.
• BIG-TIME important ...Bk1942 Amer. sl.
• BIG-TRUCE important ...Bk1942 Amer. sl.
• BOOPETY self-important, arrogant ...1948 Amer. dial.
• CHESTY arrogant, conceited, self-important, egotistical ...1899 Amer. dial.
• CONSEQUENTIOUS †* important, full of consequence ...1634
• DEEP † serious, weighty, important ...1596
• DOUBLE-BARRELLED important ...Bk1942 Amer. sl.
• DOUBLE-DISTILLED important ...Bk1942 Amer. sl.
• EARNESTFUL † important ...c1386
• EARTHSHAKING of enormous importance or consequence; momentous ...colloq.
• EARTH-SHATTERING of enormous importance or consequence; momentous ...colloq.
• FAUSTY irascible, angry, low, mean, cross; pert, impertinent, impudent, self-important; frisky, mettlesome ...1890 Amer. dial.
• FEISTY irascible, argumentative, touchy, angry, low, mean, cross; pert, impertinent, impudent, self-important; frisky, mettlesome ...1890 Amer. dial.
• FICETY irascible, angry, low, mean, cross; pert, impertinent, impudent, self-important; frisky, mettlesome ...1890 Amer. dial.
• FISTY irascible, angry, low, mean, cross; pert, impertinent, impudent, self-important; frisky, mettlesome ...1890 Amer. dial.
• FOUR-STAR important ...Bk1942 Amer. sl.
• FRONT-PAGE important ...Bk1942 Amer. sl.
• FYSTY irascible, angry, low, mean, cross; pert, impertinent, impudent, self-important; frisky, mettlesome ...1890 Amer. dial.
• GREAT SHAKES important ...Bk1942 Amer. sl.
• GUT of a political issue or the like: of fundamental importance; of extraordinary concern to voters, often engendering a visceral reaction ...1964 Amer. sl.
• GUVNOR the most important ...1970s sl.
• HEAVY important ...Bk1942 Amer. sl.
• HEAVYWEIGHT important ...Bk1942 Amer. sl.
• HEFTY important ...Bk1942 Amer. sl.
• HIGH-HEADED arrogant, haughty, self-important ...20C US sl.
• HIGH-LIGHT important ...Bk1942 Amer. sl.
• HIGH-POWERED important ...Bk1942 Amer. sl.
• HOT urgent, pressing; important (often with an implication of some danger) ...1896 Amer. sl.
• IMPORTING † of much import; important ...1579
• IN THE CATBIRD SEAT in a superior or advantageous position; feeling important ...1945 Amer. dial.
• LARGE important ...Bk1942 Amer. sl.
• MAGNIFICENT high and mighty; self-important, arrogant, conceited ...19C Brit. sl.
• MASSY self-important, conceited; boastful, bragging ...1816 Sc. & Eng. dial.
• MATTERABLE important; of consequence ...Bk1905 Eng. dial.
• MICKLE eminent, distinguished by birth or wealth; great; important ...1821 Sc.
• MOLIMINOUS † weighty, momentous, of vast importance ...1684
• MOMENTAL † very important, momentous ...1818
• MUCKLE eminent, distinguished by birth or wealth; great; important ...1821 Sc.
• OF AUGHT of importance or consequence ...1821 Sc.
• OF GREAT ARTICLE †* of great moment or importance ...1604
• OF GREAT QUARREL † of importance ...1590
• OF MARK noteworthy, important, conspicuous ...1590
• OLD MAN large, important, of lengthy duration ...M19 Aust. & NZ sl.
• ON THE MAP important ...Bk1942 Amer. sl.
• OUTWARDLY self-important, forward ...1968 Amer. dial.
• PALMARIAN * that bears or is worthy to bear the palm; holding the first or highest place; of supreme or first-rate importance; most important, pre-eminent, principal, chief ...1815
• PALMARY that bears or is worthy to bear the palm; holding the first or highest place; of supreme or first-rate importance; most important, pre-eminent, principal, chief ...1657
• PORKY important, independent ...1968 Amer. dial.
• QUITE A SHUCKS important ...Bk1942 Amer. sl.
• RATHER †* antecedent, prior; of greater importance ...1657
• SERIOUS large; intense; important ...1980s US Black sl.
• SMASH important ...Bk1942 Amer. sl.
• STANDOUT important ...Bk1942 Amer. sl.
• STUCK-UP conceited; assuming airs, dignity, or importance ...1829 colloq.
• SUBSTANTIOUS † weighty, important; solid, firm; effective ...1483 chiefly Sc.
• UMEST most important or prominent ...1513 Sc.
• UP ONE'S OWN ARSE self-important ...2000s sl.
• UPPITY self-important ...1880 sl., orig. US
• VAGOUS very important, powerful  ...1944 Amer. dial.
• VAGUS very important, powerful  ...1944 Amer. dial.
importance, important - adverbs  
• BIG CASINO in an important, committed manner ...1990s US sl.
importance, important - nouns
• ACE something useful or important ...1950s sl.
• ANYTHING MUCH a great amount; anything significant or important; often in negative constructions ...1664 
• BE-ALL AND END-ALL, THE something regarded as the most important element in something ...1854 sl.
• BIG CASINO the best; the ultimate; the most important ...1920s US sl.
• BIG DEAL something really important ...Bk2006 US sl.
• BIG END the most important part ...1968 Amer. dial.
• BIGGIE something important ...Bk2006 US sl.
• BIG PIECE OF CHEESE, THE an important object ...20C Amer. sl.
• BULGE † a very large or impressive thing; something important  ...1835 Amer. dial.
• EIGHTEEN PENCE conceit, show of importance ...Bk1900 Eng. dial.
• FANTASIA ostentation, pomp, self-importance ...1838
• FART something important or worthwhile ...1970s sl.
• GUT ISSUE the one most important issue in a discussion ...1986 US sl.
• GUTS the essentials; the most important part; the inner and real meaning; the essence of a matter ...1663 UK
• HALF OF IT, THE the most significant or important part of something; usually in negative contexts ...1932 sl.
• HARRE † a cardinal point; an important matter ...c1000 obs. exc. Eng. dial.
• HEART the best, choicest, or most important part ...1589
• HEN ON, A an urgent, important, or secret plan or project in the making ...1878 Amer. dial.
• HEN ON THE NEST, A an urgent, important, or secret plan or project in the making ...1949 Amer. dial.
• HOT SHIT ON A STICK an important or consequential person or thing; a braggart; a big deal ...1965 Amer. dial.
• IMPLEMENT †* something necessary to make a thing complete; an essential or important constituent part ...1632
• IMPORTANCY † 1. the quality of being important; importance ...1540
† 2. an important matter ...1623
• IMPORTMENT † importance, consequence ...1658
• KAHUNA a large or important person or thing ...1980s US sl.
• MAGNIFICIE †* greatness, importance ...1570
• MAHOSKA, THE n. a thing of importance or interest ...1943 Amer. sl.
• MAHOSKER, THE a thing of importance or interest ...1943 Amer. sl.
• MAIN OF ALL, THE † the important or essential point ...1595
• MAKINGS anything of importance or consequence ...1895 Eng. dial.
• MASTERPIECE † the most important feature, or the chief excellence, of a person or thing ...1612
• MASTER-WORK an action or procedure of chief importance ...c1606
• MEANT meaning; importance ...1852 Eng. dial.
• MOUTHFUL something spoken which has importance or other significance ...1916 US sl.
• MUCHITY †* a thing of importance ...1621
• NEARNESS †* importance, consequence ...1679
• PITH AND MARROW the essential or important part ...1635
• PRINCIPAL VERB † the chief or most important thing ...1616
• SHIT ON A STICK an important or consequential person or thing; a braggart; a big deal ...1965 Amer. dial.
• SHIT ON A STICK BUT HE AIN'T FART ON A SPLINTER an important or consequential person or thing; a braggart; a big deal ...1965 Amer. dial.
• SOME SHUCKINS anybody or anything large, important, superior, or remarkable ...c1939 Amer. dial.
• THRONGS matters of importance; a multitude of petty cares ...1874 Eng. dial.
• TITAN something or someone of gigantic stature or strength, physical or intellectual; an excellent person ...1828
• TONGUE OF THE TRUMP n. the most important person or thing; the principal person in any undertaking; the leader; that which is essential to the success of anything ...1820 Sc.
• VALOUR † worth or importance due to personal qualities or to rank ...c1330
• VALURE † worth, importance, efficacy ...c1400
importance, important - person
• ACE an important, influential person ...L19 US sl.
• ACE-COON an important person; a big shot ...1960s Amer. dial.
• ADMIRAL OF THE SWISS NAVY a self-important person ...World War II Amer. sl.
• ALCALDE a local official; now also any important or self-important person ...1803 Amer. dial.
• ALL THE WHOLE CHEESE a self-important person ...World War II Amer. sl.
• ARTILLERY, THE 'bigwigs'; very important persons ...1916 colloq.
• ASTOR'S PET COW a self-important person ...1967 Amer. dial.
• ASTOR'S PET HORSE a self-important person ...1967 Amer. dial.
• ASTOR'S PET PONY a self-important person ...1967 Amer. dial.
• ASTOR'S PLUSH HORSE a self-important person ...1967 Amer. dial.
• AUGER, AUGUR an important person; a foreman ...1903 Amer. dial.
• BELL-COW a leader, a big shot; a person who tries to appear important ...1896 Amer. dial.
​• BELL SHEEP a leader; a big shot; a person who tries to appear important ...1969 Amer. dial.
• BELSWAGGER one who makes a noise, and puts on an air of importance ...1721
• BEZZLER a person of importance; one who thinks himself important ...1903 Amer. dial.
• BIG an influential, important, or celebrated person; a big shot ...1833 Amer. colloq.
• BIG APPLE an important person...1899 US criminals' sl. 
• BIG ASS an influential, important or celebrated person; a big shot; used derisively ...1956 US sl.
• BIG AUGER an important person; a boss; a foreman ...1868 US West usage
• BIG BANANA an important or influential person; a boss ...1984 US sl.
• BIG BARRACUDA an important guy ...Bk2000 hipster sl. 
• BIG BEAN a person of importance ...World War II Amer. sl.
• BIG BEZESUS an important person ...1930 UK sl.
• BIG BOOT a powerful person; an important or influential person ...1969 US sl.
• BIG BOW-WOW an important person ...World War II Amer. sl.
• BIG BOY an important or influential man; also, a leading figure ...1921 colloq., orig. US
• BIG BUG (often derogatory) a person of consequence; a high-ranking or important person ...1817 US. orig. & chiefly US
• BIG BULL WITH THE BRASS COLLAR an important person, especially in a business context ...1848 US sl.
• BIG-BUTT a wealthy, influential, important, or celebrated person; an aristocrat; used derisively ...1912 US sl.
• BIG CASINO the most important or influential person in a place etc.; a big person ...1893 US sl.
• BIG CHEESE an important person, an influential figure, a boss in a situation or job ...1885 sl.
• BIG CHIEF an important or the most important man ...1912 sl., orig. US
• BIG COG an important or self-important person ...2003 sl.
• BIG DAD an important person; a person of influence and authority ...1967 US sl.
• BIG DADDY a high-ranking or important person ...1948 sl., orig. US
• BIG DEAL an important or self-important person; a celebrated person ...1947 sl., orig. US
• BIG DEALER an important or self-important person; a person who acts important ...1947 US sl.
• BIG DICK an important person ...1965 sl.
• BIG DOG a person of standing, authority, or office; a high-ranking or important person; a recognized leader or chief: a consequential pompous individual; an overbearing person who will allow no one to differ from his views ...1833 US sl.
• BIG DOG OF THE TANYARD an important or the most important person; a consequential, pompous individual ...1841 US sl.
• BIG DOG WITH THE BRASS COLLAR an important person, especially in a business context; the principal man of a place or in an undertaking ...1848 US sl.
• BIG DUDE a self-important person; a person who tries to appear important ...c1960 Amer. dial.
• BIGEE an important person ...Bk2006 Amer. sl. 
• BIG ENCHILADA a high-ranking or important person ...1973 US sl.
• BIG FEELER an arrogant or haughty person; a person who acts important ...1967 Amer. dial.
• BIG FISH a high-ranking or important person ...1836 sl., orig. US
• BIG FISH IN A LITTLE POND, A a person who is important or influential, but only within a limited area or among a small group ...Bk1999
• BIG FISH IN A SMALL POND, A a person seen as important and influential only within the limited scope of a small organization or group ...Bk2004
• BIG FROG IN A SMALL POND an important person in a small place or position; someone who is respected and honoured in a small company, school, or city; a leader in a small group ...Bk2004 Amer. colloq.
• BIGGEST DOG IN THE MEAT HOUSE an important or the most important person ...1847 US sl.
• BIGGEST DUCK IN THE PUDDLE the most important person in some small group ...Bk1996 Amer. dial. 
• BIGGEST FROG IN THE POND the most important person in some small group ...Bk1996 Amer. dial.  
• BIGGEST TOAD IN THE PUDDLE a leader, a chief, the most important person in the situation; a consequential person in a small town ...1848 US sl.
• BIGGIE an important or successful person; a 'big shot'; used esp. in the entertainment industries ...1926 sl., orig. US
• BIG GUN a person of great importance; a high-ranking or important person ...1834 sl.
• BIG GUY an important man, or one considered as such ...1901 US sl.
• BIGGY an important or successful person; a 'big shot'; used esp. in the entertainment industries ...1926 sl., orig. US
• BIG HAT a self-important person; one who acts important ...1966 Amer. dial.
• BIG HEAD an important person ...1930 US sl.
• BIG HERB an important person; used sarcastically ...c1905 Amer. dial.
• BIG HONCHO any form of important or superior person, esp. in a criminal context; a prison governor ...1970 US sl.
• BIG I an important or self-important person; a person who likes to brag ...1967 Amer. dial.
• BIG I, LITTLE YOU an important or self-important person; a person who likes to brag ...1967 Amer. dial.
• BIG IKE a self-important, conceited or pretentious person ...1902 Amer. dial.
• BIG INDIAN (now often offensive) a person of importance or influence ...1861 US sl.
• BIG INJUN (now often offensive) a person of importance ...1861 US sl. 
• BIG KAHUNA a person of great importance or power; also, a person in command, a boss; often used with 'the' ...1966 sl., orig. & chiefly US
• BIG-LEAGUER an important person ...1914 US sl.
• BIG MAGILLA an important, influential person ...2003 US sl.
• BIG MAN a man of high status or importance in a social group, organization, business, etc.; a leader, a boss ...1789
• BIG MAN WITH THE BRASS COLLAR an important person, especially in a business context ...1848 US sl.
• BIG MEDICINE an important, powerful, or influential person ...1878-9 US sl.
• BIG MONARCHER a person of note ...Bk1891 tramps' sl.
• BIG MUCKY-MUCK a superior or important person, whether actually or through pretension ...1952 US sl.
• BIG NAME a prominent, famous, important, or celebrated person, usually in the field of entertainment ...Bk1975 Amer. sl. 
• BIG NIGGER (derogatory) an important, often self-important person ...1942 Amer. sl.
• BIG NOB a very important, powerful person; a prominent and influential person in business, politics, etc. ...1905 sl., orig. US
• BIG NOISE a high-ranking or important person ...1906 sl., orig. US
• BIG NUMBER an important person ...1942 US sl.
• BIG ONE an important or consequential person ...1819 sl.
• BIG PIECE OF CHEESE, THE an important person ...20C Amer. sl.
• BIG POT a leader, a highly important person in his own particular sphere, a person of consequence ...1878 sl.
• BIG POTATO an important or powerful person ...1884 sl.
• BIG ROD an important person; a person in charge; the boss  ...1929 US sl.
• BIG SCREECH an important or celebrated person ...1912 US sl.
• BIG SHIT an important person, or one who claims to be so ...1934 US sl.
• BIG-SHIT-SHOT an important person, or one who claims to be so ...1978 US sl.
• BIG SHOT a superior person, or one who claims to be; a high-ranking, influential, important, or celebrated person ...1908 sl., orig. US
• BIG SHOW an important or self-important person ...1966 Amer. dial.
• BIG SMELL an important person; an influential figure; a boss in a situation or job ...1959 Aust, sl.
• BIG SMOKE an important person ...1909 US sl.
• BIG SNAG a superior person, or one who claims to be; a high-ranking, influential, important, or celebrated person ...1842 US sl.
• BIG SPUD an important person; one in authority ...1931 US sl.
• BIG SQUASH an important person, or someone who thinks they are so ...1910 sl.
• BIG SQUEEZE a boss or foreman; an important person; the leader of a gang; the head of any organization ...1912 US sl.
• BIG STICK an important or self-important person ; the boss ...1908 US sl.
• BIG STUFF an important or self-important person; an influential person ...1911 sl., orig. US
• BIG SUGAR an important person, an influential person; a boss in a situation or job ...1984 sl.
• BIG TIME an important person, esp. in ironic use ...1968 US sl.
• BIG-TIME CHARLIE an important person ...1998 US sl.
• BIG-TIMER an important person ...1913 sl., orig. US
• BIG TIT an important person, or one who thinks they are ...1968 US sl.
• BIG TOAD an important or self-important person ...1846 US sl.
• BIG 'UN an important person ...1836 sl.
• BIG VEGETABLE an important person, an influential person; the boss ...1977 sl., orig. US
• BIG WAZOO an important or influential person; used derisively ...1978 US sl.
• BIG WHEEL an important, influential person, esp. in business ...1933 US sl.
• BIG WHITE CHIEF an important or the most important man; a person in authority ...1916 orig. US
• BIG WIENIE a 'top dog' ...Bk1975 Amer. student sl.
• BIGWIG a high-ranking or important person ...1703 sl. 
• BIG WORKS an important person ...1912 US sl.
• BIG WOW-WOW an important person ...World War II Amer. sl.
• BLOWPOKE a fat pursy fellow, generally one who assumes an air of great importance ...Bk1875 Eng. dial.
• BLUE HEN'S CHICK an important or high-class person, or one who pretends to be ...1951 Amer. dial.
• BLUE HEN'S CHICKEN an important or high-class person, or one who pretends to be ...1946 Amer. dial.
• BOOSHWAY orig. the voyageur in charge of a trading post or expedition; hence, a boss, a leader; an important person ...1870 Amer. dial.
• BOSS DOG an important, sometimes, self-important person ...1967 Amer. dial.
• BUDGEWAY orig. the voyageur in charge of a trading post or expedition; hence, a boss, a leader; an important person ...1966 Amer. dial.
• BUFF a self-important person ...20C Irish
• BUG an important person or one who thinks himself so; a big shot ...1843 Amer. dial.
• BUGHEWAY orig. the voyageur in charge of a trading post or expedition; hence, a boss, a leader; an important person ...1850 Amer. dial.
• BUSH a person who tries to appear important ...1968 Amer. dial.
• BUSHWA orig. the voyageur in charge of a trading post or expedition; hence, a boss, a leader; an important person ...1966 Amer. dial.
• CACK a respected person; an important figure in the community ...1900s US Black sl.
• CAT'S ASS (derogatory) a self-important person ...1967 Amer. dial.
• CAT'S WHISKER a person who feels important ...c1950 Amer. dial.
• CAT'S WHISKERS a person who feels important ...c1950 Amer. dial.
• CHIEF ITCH AND RUB the most important person; the head of any group, as a school principal, Army officer, office overseer, etc. ...20C Amer. sl.
• COCKALORUM a self-important little man; a person of consequence; a term of contempt ...c1715
• COCK OF THE MIDDEN the principal person of a place, one who rules everybody else in his own house or neighbourhood ...1889 Eng. dial. 
• DADDY a man who is an important influence in a field; also, a forerunner or progenitor ...1925 sl. 
• FACE CARD an important person ...1970s Amer. sl.
• FANCY PANTS a dandy; a pretentious, superior, self-important person ...1934 US sl.
• FLY ON THE COACH WHEEL a person who fancies himself of mighty importance, but who is in reality of none at all ...1870
• GALLIMAUFRY * a man of many accomplishments; one who is important; said somewhat contemptuously ...1600
• GEAR an important or influential person ...1955 US sl.
• GEE, THE the most important person in a given environment; the leader ...1964 US sl.
• GILDED ROOSTER a man of importance ...1888 sl.
• GOV'NOR a boss; an important, influential person ...M19
• GREAT GUN a person of great importance ...1657 colloq.
• GREAT MAGOO one who thinks he is important ...1959 Amer. sl.
• GREAT POT an important person ...1912 Amer. dial.
• GUN an important person ...1830 Amer. sl.
• GUV a boss; an important, influential person ...M19
• GUVNER, GUVNOR the person in charge; the most important person ...1802 Brit. sl.
• HALF-NIB, HALF-NIBS one who apes gentility or importance; also, a gentleman who has come down in the world ...Bk1812 sl.
• HEAD * a person holding a pre-eminent position; the best or most important person ...a1200
• HEAD BUMMAROO the chief, the person in charge; the most important person present; the manager ...1984 UK sl.
• HEAD-BUMMER a manager; an overseer; a prominent or important person; sarcastically, and officious person ...1887 Sc.
• HEAD CHEESE an important person, an influential figure, a boss in a situation or job ...1913 US sl.
• HEAD GEE, THE the most important person in a given environment; the leader ...1912 Aust. sl.
• HEAD KNOCK an important, outstanding person ...1953 US Black sl.
• HEAD-MUCK one who takes the chief part in anything; a leader, a person of consequence, a master ...Bk1902 Eng. dial.
• HEAD NIGGER an important, often self-important person ...1966 Amer. sl.
• HEAD RAMMER a big shot in an organization or group ...Bk1992 Amer. 
• HEAD-SHA-RAG one who takes the chief part in anything; a leader, a person of consequence, a master ...1893 Eng. dial.
• HEAD-SIR-RAG one who takes the chief part in anything; a leader, a person of consequence, a master ...1893 Eng. dial.
• HEAD SQUEEZE a boss or foreman; an important person; the leader of a gang; the head of any organization ...1966 Amer. dial.
• HEAD WOMAN a woman in charge of a household, department, institution, etc.; the most important woman in a group, business, or organization ...1799
• HEAVY an important, influential, or powerful person ...1925 US sl.
• HEAVY ARTILLERY, THE 'bigwigs'; very important persons ...1916 colloq.
• HEAVY HITTER a particularly important, powerful, or influential person ...1922
• HEAVY NUMBER an important or influential person ...1971 sl.
• HEAVY ROLLER a very important person ...1974 US sl.
• HEAVYWEIGHT a person of importance; one of much influence ...1857
• HE-COON a prominent or influential man; an important, powerful man ...1897 US sl.
• HERB an important person ...1975 Amer. dial.
• HER NIBS an important, impressive person ...1878 sl.
• HIGH COCKALAVITCH a person who tries to appear important; a  high-and-mighty person; one who makes empty boasts ...1968 Amer. dial.
• HIGH COCKALORUM an important person; a self-important person ...1878 sl., orig. US
• HIGH COLLAR an important or prominent person in a community ...1926 Amer. dial.
• HIGH-FLYER an important person, or one who poses as such ...1824 US sl.
• HIGH GAZABO an important person ...c1935 US sl.
• HIGH GUY an important person; a big shot ...1896 US sl.
• HIGH-HAT a person who behaves arrogantly and snobbishly; a putatively important person ...1925 US sl.
• HIGH-HATTER a person who behaves arrogantly and snobbishly; a putatively important person ...1925 US sl.
• HIGH-HEAD an important person ...1954 Amer. dial.
• HIGH MAN ON THE TOTEM POLE a person of authority and importance ...Bk1980 Amer. sl. 
• HIGH MICKEY-DOODLE, HIGH MICKY-DOODLE a superior or important person, whether actually or through pretension ...1918 US sl.
• HIGH-MONKEY-MONK an important, pompous person; a socially prominent person; the principal person; the chief; used disparagingly and jocularly ...c1865 Amer. sl.
• HIGH MONKEY-MUCK a superior or important person, whether actually or through pretension ...M19 US sl. 
• HIGH MUCK a person of real or imagined authority; a self-important person; an important, pompous person; a socially prominent person ...1856 Amer. dial.
• HIGH-MUCK-A-MUCK a superior or important person, whether actually or through pretension; a self-important person ...1856 Amer. sl.
• HIGH MUCK-DE-MUCK a person of high status and influence; an important person ...1882 colloq. orig. & chiefly Amer.
• HIGH MUCKETY-MUCK, HIGH MUCKITY-MUCK a person of high status and influence; a superior or important person ...1882 colloq. orig. & chiefly Amer.
• HIGH MUCKIE-MUCK, HIGH MUCKY-MUCK an important, pompous person; a socially prominent person; used disparagingly and jocularly ...c1865 Amer. sl.
• HIGH MUCKTY-MUCK a person of high status and influence; a superior or important person ...1882 colloq. orig. & chiefly Amer.
• HIGH MULDOON a person of high status and influence; a superior or important person ...1905 US sl.
• HIGH PILLOW an important person; a big shot ...1940 Amer. sl.
• HIGH PRIEST a man regarded as comparable to a high priest; the chief male advocate or proponent of a particular belief, practice, etc.; an important or notable man in a particular sphere ...1737
• HIGH PRIESTESS a woman regarded as comparable to a high priestess; the chief female advocate or proponent of a particular belief, practice, etc.; an important or notable woman in a particular sphere ...1771
• HIGH SHOT a superior or important person or one who claims to be superior ...1926 sl., orig. US
• HIGH-TONE an important person; a pretentious person ...1800 US sl.
• HIGH-TONER an important person; a dignified or prominent person; a pretentious or snobbish person ...1876 Amer. dial.
• HIGH-UP a high-ranking, influential, or important person; the boss, the leader; a person in authority ...1882 colloq.
• HIGH-YOU-MUCK-A-MUCK a person of high status and influence; an important or self-important person ...1856 colloq, orig. & chiefly Amer.
• HINCHY a snobbish, pompous, or overbearing person; a prominent or important person ...1984 Amer. dial.
• HINCTY a snobbish, pompous, haughty, or overbearing person; a prominent or important person ...1952 US sl.
• HINKTY a snobbish, pompous, or overbearing person; a prominent or important person ...1970 Amer. dial.
• HIS FEATHERS an important or self-important person ...1901 US sl.
• HIS NIBS a very important person, a supervisor or chief, esp. one who insists on deferential treatment ...1812 US sl.
• HI-U-MUCK-I-MUCK a superior or important person ...1862 US sl.
• HI YOU MUCK A MUCK a person of high status and influence; an important person ...1856 colloq, orig. & chiefly Amer.
• HOT SHIT ON A STICK an important or consequential person or thing; a braggart; a big deal ...1965 Amer. dial.
• HOTTIE, HOTTY * a skilled, successful, or important person ...1910 Aust. & NZ sl.
• HUGGINS AND MUGGINS a pretender to importance ...Bk1922
• I AM a self-important person ...1926 sl.
• IKE a self-important, conceited or pretentious person ...1902 Amer. dial.
• JACK THE BISCUIT a show-off; someone who is important or self-important enough to be ostentatious ...2002 UK sl. 
• JAKE GOULD one who is rich and important ...1965 Amer. dial.
• JOE GUN a 'big 'shot' ...Bk1942 US sl.
• KACK an important person ...1900s US Black sl.
• KAHUNA a large or important person or thing ...1987 US sl.
• KING BEE a man in a position of authority or dominance; a person who tries to appear important ...1875 Amer. dial.
• KING PIN the most important or outstanding person in an organization, enterprise, etc. ...1861
• KNOCKER an important or self-important male; a show-off ...20C US sl.
• LADY ESTHER a pretentious or self-important woman ...1966 Amer. dial.
• LADY ESTHERBILT a pretentious or self-important woman ...1966 Amer. dial.
• LEAD NIGGER an important, often self-important person ...1966 Amer. sl.
• LOUDSPEAKER a braggart or loudmouth; an important person or one who regards himself as important ...1934 US sl.
• MACHER an extremely influential person; an important and powerful man ...1930 Amer. sl., esp. political journalism usage
• MACK DADDY an important, influential Black man, a power in the community; a very successful or skilful man ...1990s US Black sl.
• MAGOO an important person ...1932 Amer. sl.
• MAIN GUY, THE a man of importance, prominence, or authority; the boss; the leader ...1882 Amer. sl.
• MAIN KAZAAM a person of importance ...20C US sl.
• MAIN KAZOO a man of importance or authority ...1903 Amer. sl.
• MAIN MAN, THE an eminent or important man ...1977 Amer. sl.
• MAIN SQUASH the most important person ...1900s US sl.
• MAIN SQUEEZE a boss or foreman; an important person; the leader of a gang; the head of any organization ...1896 Amer. sl.
• MAIN STEM, THE a person of importance; the boss ...L19 US sl.
• MAN, THE an important person ...1960s Amer. sl.
• MARCUS SUPERBUS a person of high rank or eminence; an important person ...1896 Brit. theatrical sl.
• MARCUS SUPERFLUOUS a person of high rank or eminence; an important person ...1896 Brit. theatrical sl.
• MCDADDY an important, influential Black man, a power in the community; a very successful or skilful man ...1990s US Black sl.
• MISTAH BIG, MISTER BIG an important, influential person, esp. a 'criminal mastermind' ...1930s sl., orig. US
• MOBY DICK a large, important, or impressive man ...a1974
• MOCHER an important, influential, powerful person ...1990 US sl.
• MOGUL an important, influential, powerful, or dominant person; an autocrat; a business or media magnate ...1653
• MONKEY-MONK a superior or important person, whether in fact or through pretension; a self-important person; an aristocrat ...1880 US sl.
• MONKEY-MUCK a person of real or imagined authority; one who tries to appear important ...1882 Amer. dial.
• MR. BIG an important, influential person, esp. a 'criminal mastermind' ...1930s sl., orig. US
• MRS. JAY GOULD a woman who is rich and important ...1965 Amer. dial.
• MUCK an important or self-important person ...1900s US sl.
• MUCK-A-MUCK an important or self-important person; a prominent person ...1856 US sl.
• MUCKETY-MUCK an important or self-important person; a prominent person ...1856 US sl.
• MUCKY-MUCK a self-important person ...1968 Amer. sl.
• NAB a man of importance; a conceited person ...1796 Sc.
• NABE an important person ...E19 UK criminals' sl.
• NABOB a person of great wealth or high rank; one who returned from India with a large fortune acquired there; a very rich, important man ...1764 
• NAME an important or famous person ...1975 US sl.
• NOBS a person of importance ...1877 Amer. sl.
• NOISE a self-important person ...1908 Amer. sl.
• NUMBER UNO the leader or most important person in any situation ...Aust. sl.
• OCHT a person of consequence, a 'somebody' ...1856 Sc.
• PIPERS Pretty Important Persons ...Bk1947 US Army sl.
• POPPA LARGE an important, influential figure ...1990s US Black teen & East Coast sl.
• POT an important person ...1887 sl.
• SAMPSON PECKETT, SAMSON PECKETT a person of great consequence ...1876 Eng. dial.
• SATRAPON † an important personage ...1650
• SHIT ON A STICK an important or consequential person or thing; a braggart; a big deal ...1965 Amer. dial.
• SHIT ON A STICK BUT HE AIN'T FART ON A SPLINTER an important or consequential person or thing; a braggart; a big deal ...1965 Amer. dial.
• SIRE a person of some note or importance; an aged or elderly man; also, generally, a man, a fellow ...1362
• SOME SHUCKINS anybody or anything large, important, superior, or remarkable ...c1939 Amer. dial.
• SQUEEGEE a person of importance; used derisively ...Bk1913-17 Amer. dial.
• STANG OF THE TRUMP - the most active and vocal person in a group; the chief and indispensable member of a company ...1843 Sc.
• TALLBOY an important person ...1820
• TALLEST TOAD IN THE PUDDLE an important or self-important person ...1855 Amer. dial.
• TALL POPPY a person who has a high salary or is otherwise prominent; one who is distinguished or notable; a very important person; an influential person; a person with status; often held in contempt by others, who try to bring about this person's downfall or ruin ...1931 Aust. colloq.
• TANG O' THE TRUMP, THE the most important person in any company, enterprise, or organization; the life and soul of a party, a movement, etc. ...1887 Sc.
• TINHORN someone, esp. a gambler, who pretends to be important but actually has little money, influence, or skill ...1880 sl.
• TITAN something or someone of gigantic stature or strength, physical or intellectual; an excellent person ...1828
• TITANESS a female of great, strength, intellect, or importance ...1596
• TONGUE OF THE TRUMP the most important person or thing; the principal person in any undertaking; the leader; that which is essential to the success of anything ...1820 Sc.
• TOP CAT the most powerful or important person ...colloq.
• TOP DOG the victorious or dominant party; one who has influence, an important or superior person ...1900
• TOP HAT an important person, a bigwig ...1946 Amer. dial.
• TOP SAWYER the leader in any profession, job, or occupation; a superior; a person of importance; the best person ...1826 sl.
• TYEE, TYHEE a high-ranking or important person ...1792 N. Amer. sl.
• VEEP a very important person ...1945 US sl.
• VIPERS Very Important Persons ...Bk1947 US Army sl.
• WARM WEATHER an important person; a self-important person ...1904 US sl.
• WHEEL a high-ranking or important person ...1933 sl., orig. & chiefly US
• WHISTLE-BREECHES (derogatory or teasing) a nickname for a self-important person ...1904 Amer. dial.
• WHISTLE-BRITCHES (derogatory or teasing) a nickname for a self-important person ...1904 Amer. dial.
• WISE IKE a self-important, pretentious person ...20C sl.
importance, important - verbs
• ARGUFY to be of importance, consequence, or use; to signify ...1751 colloq.
• BEEF UP to strengthen; to add vigour, power, or importance to ...1941 sl.
• BE TOO BIG FOR ONE'S BRITCHES to assume more than one's proper authority; to feel important, independent, or disturbingly confident ...1835 Amer. dial.
• BIG-NOTE YOURSELF to overstate your importance ...1953 Aust. sl.
• BOTHER ONE'S TIME to matter, to be of importance ...1933 Amer. dial.
• CARRY A GREAT FACE † to have an appearance of importance ...1674
• COME TO THE BOIL to reach an important or critical stage ...Bk1999 
• DO A WALKABOUT of an important person: to make an informal tour on foot ...1984 UK sl.
• DUCHESS to treat as a VIP ...1956 Aust. sl.
• FART THROUGH SILK to live a life of luxury and ease; to live prosperously; to feel happy; to be important ...1927 US sl.
• GET THE MESSAGE to grasp the import of something said ...1964 sl.
• HANG THE MOON to be very powerful or important; to be exceptionally able or talented ...1953 Amer. dial.
• HAVE A HEN ON to have an urgent, important, or secret plan or project in the making ...1916 Amer. dial.
• HAVE A HEN ON THE NEST to have an urgent, important, or secret plan or project in the making ...1949 Amer. dial.
• HAVE OTHER HAFT(S) IN HAND † to have other business to do, other fish to fry ...c1440
• PACK A KICK to be influential or important ...1910s sl., orig. US
• PACK A PUNCH to be influential or important ...1910s sl., orig. US
• PACK A WALLOP to be influential or important ...1910s sl., orig. US
• PACK ONE to be influential or important ...1910s sl., orig. US
• SAY A MOUTHFUL to say something important and true ...1910s orig. US
• SAY AN ARMFUL to say something important and true ...1910s orig. US
• SAY SOMETHING to make an important statement, to say something profound ...1910s US sl.
• SPEAK A MOUTHFUL to say something important and true ...1910s orig. US
• TAKE † to assume authority or importance ...c1470

IMPORTED - adjectives
• BROUGHT-ON commercially made; not home-made; imported ...1895 Amer. dial.
• BRUNG-ON commercially made; not home-made; imported ...1937 Amer. dial.

IMPORTER - person
• INBRINGER an importer, one who brings in goods for sale ...1921 Sc. 

IMPORTUNATE - adjectives
• ANWILL † self-willed, stubborn, obstinate; persistently desirous, importunate ...c897
• ONWIL † self-willed, stubborn, obstinate; persistently desirous, importunate ...c897
• ONWILL † self-willed, stubborn, obstinate; persistently desirous, importunate ...c897
importunate - verbs 
• YAAG to be importunate, to insist irritatingly with questions or requests, to nag or harp on ...1825 Sc.
 
IMPORTUNATELY - adverbs
• BESIEGINGLY * urgently, importunately ...1822
 
IMPORTUNE - verbs
• BONE to beg; to wheedle; to request demandingly, to importune ..1858 Amer. dial.
• DING to reiterate, to repeat, to importune; to harp on one subject ...1790 Sc. & Eng. dial.
• EARWIG to urge, to importune; to pester with private importunities or admonitions; to influence or bias a person by secret communications ...1837
• EGG to tease, to annoy, to pester, to irritate; to importune, to find fault continually, to nag ...1746 Eng. & Amer. dial.
• LOPE to importune ...Bk1902 Amer. dial.
• NIGG to importune, to trouble with repeated requests or inquiries, to nag or carp at ...1866 Sc. 
• RAVEN to importune persistently ...B1900 Eng. dial.
• TERRIFY to annoy, to irritate; to tease, to worry; to importune; to torment, to pain ...1839 Eng. dial.
• TEW to annoy. to vex; to tease, to importune, to pester; to urge, to persuade ...1781 Eng. dial.
• THRAVE † to urge, to importune ...1671 Eng. dial.
• YAG to make a noise; to talk angrily; to importune incessantly; to irritate, to nag; to quarrel ...1892 Sc. & Eng. dial.
 
IMPORTUNING - nouns
• NARG continual grumbling, importuning, or fault-finding; peevish wrangling ...1866 Sc.
 
IMPORTUNITY - nouns
• IMPORTANCY † urgency, importunity ...1598-9
 
IMPOSE - adjectives
• IMPONENT that imposes ...a1882
 
IMPOSE ON/UPON - person
• BANTERER one who imposes on, or bamboozles ...1709 arch.
• BOT a habitual borrower or cadger; a scrounger; a person who frequently imposes on others ...1916 Aust. & NZ sl.
• FOUR-FLUSHER someone who imposes on others by bluffing ...1904 US sl.
• GAGGER a person who imposes on another ...1825
• QUANDONG * a person who deceives, exploits, or imposes on others ...1939 Aust. sl.
impose on/upon - verbs
• BALAHACK to impose upon ...1930s US sl.
• BALLYHACK to impose on ...1952 Amer. dial.
• BAM to hoax, to practice on the credulity of; to deceive, to delude, to impose upon, to play a joke or trick on a person...1738 Sc. & Eng. dial.
• BANTER to impose upon a person, orig, in jest; to delude, to cheat, to trick, to bamboozle ...a1688 arch.
• BEGAB † to fool with words, to mock, to deceive, to delude; to impose upon ...1297
• BEGULL † to gull, to impose upon ...1605
• BLUDGE to shirk responsibility or hard work; to impose on; to cadge or scrounge ...1919 sl.
• BOLLYHOCK to impose on ...1952 Amer. dial.
• BRONZE † to impose upon, to cheat ...1817 sl.
• BUDDY-FUCK to impose on, betray or otherwise inconvenience a friend ...1960s US sl., mainly military
• CANT to deceive by pious pretenses; to impose upon ...1877 Eng. dial.
• COME HALF LARKS WITH SOMEONE to impose on someone's credulity ...1923 Brit. sl.
• COME THE OLD SOLDIER to wheedle; to impose on someone ...1818 UK sl., orig. military
• DEADBEAT to waste time; to idle about; to take advantage of, to impose on ...1881 Amer. dial.
• GAGGER to deceive, to take in or impose upon a person ...L18 sl.
• GAS to deceive or impose upon by talking 'gas' or nonsense ...1847 US sl.
• HORSE AROUND to impose on contemptuously ...1938 US sl.
• ILLUDE * to trick, to impose upon, to deceive with false hopes ...1447
• IMPONE † to impose upon ...1640
• JIG to cheat; to delude; to impose upon ...1876 sl.
• MOMMOCK to harass, to tease, to annoy, to torment, to impose on ...1946 Amer. dial.
• MUMMICK to harass, to tease, to impose on, to annoy, to torment ...1966 Amer. dial.
• PALM † to play a trick, to cheat; to impose upon a person ...1686
• PECK ON to take advantage of; to impose on; to bully ...1899 Amer. dial.
• PLAY ONE A PAGEANT † to play him a trick; to impose upon or deceive him ...1530
• POLE ON to impose on someone; to not do one's fair share of work ...1906 Aust. sl.
• PUT ON A CRUMB ACT to impose on another person ...1950s Aust. sl.
• QUEER to impose on, to swindle, to cheat ...1797 sl.
• RATCH to stretch, to extend; to exaggerate, to lie; to impose upon ...1819 Eng. dial.
• RETCH to stretch, to extend; to exaggerate, to lie; to impose upon ...1819 Eng. dial.
• TAKE IN to deceive, to cheat, to trick, to impose upon, to hoax ...1740 colloq.
• TOP † to practice trickery; to impose upon ...1664
• VERSE † to impose upon; to cozen, to cheat, to defraud ...1591 cant
• WALK HEAVY to impose oneself on the world, to walk about in a deliberately self-assured manner ...1960s US Black sl.
 
IMPOSED ON, UPON - adjectives
• BLAIT stupid, easily imposed on ...Bk1911 Sc.
• EASY easily taken advantage of or imposed upon; gullible ..1698
• IMPOSABLE * capable of being imposed upon or cheated; gullible, dupable ...a1734
• LAME easily imposed upon; stupid; inept; ineffectual; incompetent; unaware; inexperienced ...1935 US sl., esp. Black usage
• TANDIDDLED imposed upon; bewildered; cheated ...1876 Eng. dial.
• TARRADIDDLED imposed upon, as by lies; puzzled; bewildered ...Bk1905 Eng. dial.
imposed upon - person
• BAWKEN a simple, unsuspecting person; one easily imposed upon ...1924 Sc.
• GAGGEE one who is imposed on by another; a gullible person ...1819
• GAUVEY a fool, a simpleton, a dunce; a half-witted person; a vacant-minded person, one that is easily imposed upon ...1796 Eng. dial.
• GAUVISON an awkward, gaping fellow; a fool, a simpleton, a silly, staring fellow, a blockhead; a dunce; on easily imposed upon ...1788 Eng. dial.
• GECK † a fool, a simpleton, a dunce; a stupid, clumsy fellow; one who is befooled or derided, one easily imposed on, a dupe ...c1530 obs. exc. Eng. dial.
• LAIN, LANE a person easily imposed upon or cheated; a victim; also, one who is foolish or socially unsophisticated ...1933 US sl., esp. Black & criminals' usage
• MOOCH a slow-witted person; one who is easily cheated, deceived, imposed upon, or swindled; a gullible or naive person; a dupe, a sucker ...1910 colloq.
• SART-AND-FAIR a foolish, weak person; one easily imposed upon ...1777 Eng. dial.
• SART-POLL a foolish, weak person; one easily imposed upon; a good-for-nothing fellow ...1867 Eng dial.
• SAUCHEN-TOUP a simpleton; one who is easily imposed on ...1825 Sc.
• SAUSAGE a person easily imposed upon; an ineffectual person ...1896 US college sl.
• SCONE a weak-willed, irresolute person; one who is easily imposed on, a softie ...1969 Sc.
• SILLY OLD SAUSAGE an ineffectual, easily imposed-upon person ...L19 sl.
• SILLY SAUSAGE an ineffectual, easily imposed-upon person ...L19 sl.
• ZATENFARE a foolish, weak person; one easily imposed upon ...1777 Eng. dial.
imposed upon - phrases
• WILL YOU TAKE EGGS FOR MONEY? will you allow yourself to be imposed upon? ...1633
 
IMPOSING - adjectives
• BELLISAND elegant; of imposing appearance ...Bk1911 Sc.
• MAGNIFIC imposing by vastness or dignity ...1558-66
• MAGNIFICAL imposing by vastness or dignity ...1572 arch.
• MAGNITUDINOUS involving greatness of scale; great, magnificent, imposing ...1803
• TEN-CARAT big; impressive; imposing ...Amer. sl.
• VOGIE of things: imposing, grand, ostentatious ...1722 Sc.
• WALLIE of things: large, ample, considerable, substantial, heavy, strong, imposing ...1500-20 Sc.
• WALLY of things: large, ample, considerable, substantial, heavy, strong, imposing ...1500-20 Sc.
imposing - person 
• BELLONA a spirited woman of commanding presence; an imposing and strong-willed woman; a courageous woman; a heroine ...1820
• DEAD NAIL a shrewd, imposing criminal; a person of an over-reaching, imposing disposition ...E19 sl.
• NAIL a person of an over-reaching, imposing disposition ...1812 sl.
• NAILING RASCAL a shrewd, imposing criminal; a person of an over-reaching, imposing disposition ...E19 sl.
• NAILS a shrewd, imposing criminal; a person of an over-reaching, imposing disposition ...E19 sl.
 
IMPOSITION - nouns
• BAM a story intended to impose upon the credulous; a hoax or imposition; a trick, a joke ...1762 Sc. & Eng. dial.
• BITE † an imposition, a deception; what is now called a 'sell'; passing from the notion of playful imposition or hoax, to that of swindle or fraud ...1711 sl.
• IMPOSAL †* the act of imposing; imposition ...1641
• IMPOSEMENT * the act of imposing; imposition ...1664
• IMPOSURY imposition ...1892 Ireland
• ON-LIG a burden, a heavy imposition or responsibility ...Bk1905 Eng. dial.
 
IMPOSSIBILITY - nouns
• NO-NO an impossibility; a failure; any negative outcome ...1975 UK sl.
• UNPOSSIBILITY impossibility ...Bk1905 Eng. dial.
 
IMPOSSIBLE - adjectives
• BENEEK contrary, impossible ...1960s S. Afr.
• LAPUTAN pertaining to Laputa, the flying island in Gulliver's Travels; hence, visionary, absurd, fanciful, preposterous, ridiculous, impossible ...1866
• NO SOAP not possible or successful ...US & Can. sl.
• NOT AN EARTHLY no chance at all; absolutely impossible ...M18 sl.
• NOT ON unacceptable, impossible; not permissible; forbidden; not going to happen ...1972 sl.
• SICK AND WRONG absolutely impossible, unthinkable, totally disgusting; also used ironically ...1980s US campus sl.
• SNOOKERED placed in a deliberately difficult position or impossible situation ...1915 UK sl.
• UNABLE † not able to be done, impossible ...c1400
• UNPOSSIBLE impossible ...1862 Sc. & Eng. dial.
impossible - nouns
• BLUE DAHLIA something impossible or unattainable; something rare or unheard of ...1880
• KANGAROO FEATHERS an impossible thing, often an unlikely story ...1910s Aust. sl.
impossible - verbs 
• BANG ONE'S HEAD AGAINST A BRICK WALL to try to achieve something impossible
• BELIEVE THE MOON IS MADE OF CHEESE to believe firmly something astounding, impossible, or absurd; hence, to be a fool ...18C colloq.
• BOIL THE OCEAN to waste one's time attempting to do the impossible ...Bk2006 US sl.
• CATCH A HARE WITH A TABOR † to seek to do something almost impossible ...1546
• CATCH THE WIND WITH A NET to attempt the impossible ...1868
• CHANGE A FLY INTO AN ELEPHANT to undertake an impossible task ...1809
• CUT SMOKE WITH A LEATHER HATCHET to attempt impossibilities ...B1900 Eng. dial.
• DRINK UP THE SEA to attempt the impossible ...B1900
• GAPE AGAINST A RED-HOT OVEN to do something impossible ...1893 Eng. dial.  
• HUNT FOR A HARE WITH A TABOR † to seek to do something almost impossible ...1399
• HUNT FOR HARES WITH A TABOR † to undertake an almost impossible or hopeless task ...1592
• IMPOSSIBILITATE * to render impossible ...1633
• LOOK FOR A NEEDLE IN A BOTTLE OF HAY to attempt an extremely difficult, impossible, or foolish task ...1742
• LOOK FOR A NEEDLE IN A HAYSTACK to attempt an extremely difficult, impossible, or foolish task ...1855
• LOOK FOR A NEEDLE IN A MEADOW to attempt an extremely difficult, impossible, or foolish task ...c1530
• MILK THE BULL to attempt the impossible ...M18 Brit. colloq.
• MILK THE PIGEON to attempt the impossible ...M18 Brit. colloq.
• MILK THE RAM to attempt the impossible ...M18 Brit. colloq.
• NAIL JELL-O TO A TREE to do the impossible ...1980s US college sl.
• PUSH SHIT UPHILL to attempt a difficult or impossible task ...1983 Aust. & NZ 
• PUT A ROPE TO THE EYE OF A NEEDLE to attempt the impossible or absurd; to act foolishly and to no purpose ...B1900
• SANDPAPER THE ANCHOR to perform a job that need not and, in fact, cannot be performed ...1975 US sl.
• SEEK A HARE IN A HEN'S NEST † to attempt something that is almost impossible ...1599
• SEEK A NEEDLE IN A BOTTLE OF HAY to attempt an extremely difficult, impossible, or foolish task ...1690
• SEEK A NEEDLE IN A TRUSS OF HAY to attempt an extremely difficult, impossible, or foolish task ...1711
• SET THE TORTOISE TO CATCH THE HARE † to seek to do something almost impossible ...1798
• SHOOT THE GULF to succeed in a very hard task; to achieve the impossible ...1629 nautical usage
• SNATCH A CLUB FROM HERCULES to attempt an impossible or very difficult task ...1832
• TAKE HARES WITH FOXES † to seek to do something almost impossible ...1577
• TEACH A PIG TO PLAY ON THE FLUTE to attempt the absurd or impossible ...1884
• TEACH IRON TO SWIM to achieve the impossible ...B1900
• THROW STRAWS AGAINST THE WIND to essay the impossible ...Bk1904 sl.
• WASH A NEGRO † * (now offensive) to attempt an impossible task ...1611
 impossible - interjections/phrases
• FALSE! no! impossible! that's not true! ...1989 US campus sl.
• IF THE CAT WENT A POUND an expression of impossibility ...1990s Irish sl.
• IN A PIGS! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• IN A PIG'S ARSE! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• IN A PIG'S ASS! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• IN A PIG'S BUTT! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• IN A PIG'S EAR! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• IN A PIG'S EYE! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• IN A PIG'S GIZZARD! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• IN A PIG'S HOLE! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• IN A PIG'S NECK! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• IN A PIG'S POKE! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• IN A PIG'S SNOUT! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• IN A PIG'S TIT! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• IN A PIG'S TONSIL! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• IN A PIG'S VALISE! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• IN A PIG'S WIG! completely impossible! absolutely not! I don't believe you! go away! ...M19 sl., orig. US
• NO CAN DO cannot do, impossible ...M19 sl.
• NOT FOR THE LIFE OF YOU expresses the impossibility of your doing or understanding something ...1809
• NO WAY IN THIS WORLD! impossible! ...Bk1913-17 Amer. dial.

IMPOSTOR - person
• ABUSER † one who perverts truth or abuses confidence; a deceiver or impostor ...1579
• BITE † a sharper, a swindler, a cheat, a trickster, an impostor ...Bk1698
• BLUFF an impostor; a deceiver, one who bluffs ...M19 sl.
• BUNYIP an impostor ...1852 Aust.
• CAFARD † a hypocrite, an impostor ...1539
• DEADBEAT an impostor or pretender; a fraud; a cheat ...1873 Amer. sl.
• FACTOR a cheat or impostor; a fraudulent fortune-teller ...16C UK criminals' sl.
• FAITOUR † an impostor, a cheat; a vagrant who shams illness or pretends to tell fortunes ...a1340 obs . exc. arch.
• FAKE an impostor; broadly, an affected or insincere person ...1886 Amer sl.
• FATER a cheat or impostor; a fraudulent fortune-teller ...16C UK criminals' sl.
• FAYTER a cheat or impostor; a fraudulent fortune-teller ...16C UK criminals' sl.
• FLAT-CATCHER an impostor ...1823 sl.
• HALTER-CARRIER an impostor; in the early days if a horse escaped and followed a trail back, the people who lived along the way boarded the owner free of charge until he had found the horse; men who wanted to return to Kentucky or Ohio made their way easily, therefore, by carrying a bridle or halter as if they were looking for a horse ...1912 Amer. dial.
• HINGKAPONK an impostor, or deceiver ...Bk1898 Eng. dial.
• HINKAPONK an impostor ...Bk1902 Eng. dial. 
• IMPOSITOR an impostor ...1916 Amer. dial.
• IMPOSTRESS * a female impostor ...1614
• IMPOSTRIX †* a female impostor ...1655 
• JAPER † a trickster, a deceiver, a seducer, an impostor ...1362
• MOUNCH PRESENT † a 'maunche present'; a term of contempt for: a slanderer; a cheat; an impostor; a glutton ...1440
• NAIL an impostor; a cheat; one who 'takes in' another ...1874 Eng. dial.
• OPERATOR a cheat, an impostor, a quacksalver ...1611
• POT-WALLOPER (derogatory) a fool, a stupid person; also, an impostor, an upstart ...1820
• QUIRK a cheat; an impostor ...Bk1905 Eng. dial.
• RAP a cheat, an impostor; a person of bad character ...1848 Sc. & Ireland
• RINGER an outsider or intruder; a phoney person or thing; an impostor;  a person who attaches himself or herself to a political or other group to which he or she does not belong, or who votes in a district where he or she does not reside ...1896 US
• SCALLAWAG, SCALLOWAG an impostor or intriguer, especially in politics; a corrupt politician; in U.S. Hist., a native white of the southern states who was willing to accept the terms of Reconstruction after the US Civil War (1861-5) ...1864
• SCALLYWAG - an impostor or intriguer, especially in politics; a corrupt politician; in U.S. Hist., a native white of the southern states who was willing to accept the terms of Reconstruction after the US Civil War (1861-5) ...1864
• SCHLENT an impostor ...1920s sl.
 
IMPOSTURE - adjectives
• IMPOSTORIOUS †* having the character of an impostor or imposture; fraudulent; deceitful ...1623 
• PRESTIGIATORY † practising 'prestigiation'; juggling, conjuring; consisting of tricks, impostures, or illusions; deceptive, delusive ...1588
imposture - nouns
• ABUSION † perversion of the truth; deceit, deception, imposture; also, an instance of such perversion or deception ...c1386
• BILLYBLINDER a 'blind', an imposture ...1822 Sc.
• FALSEHOOD † deception, falsification, imposture; a forgery, counterfeit ...1340 obs. or arch.
• GAFF † a pretense; an imposture ...1877 UK prison sl.
• HOCUS juggling, imposture ...M17 sl.
• HOCUS-POCUS a juggler's trick; thus any form of imposture, trickery ...E18 sl.
• HOOK AND SNIVEY, HOOK AND SNIVVY, HOOKEM-SNIVEY, HOOKUM-SNIVEY an imposture or deceit; trickery ...1781 Eng. dial. & sl.
• SCREW a dishonest trick; an imposture; a cheat ...Bk1904 Eng. dial.
 
IMPOTENCE - nouns
• BREWER'S DROOP temporary impotence as a result of drinking excessive amount of alcohol, esp. beer ...1970 sl., orig. Aust.
• BREWER'S GOITRE a paunch developed by drinking too much beer ...1953 Aust. sl.
 
IMPOTENT - adjectives
• BEDRID worn out, decrepit, impotent ...1621
• BOUND impotent, lacking in manhood ...1930 Amer. dial.
• GELD † sexually impotent ...c1325
• IMPUDENT impotent ...E17 Brit. sl.
• IMPUISSANT weak, feeble, impotent, powerless ...1629
• LIMBER-DICKED impotent ...1984 Amer. sl.
• NO MONEY IN HIS PURSE impotent ...19C Brit. sl.
impotent - adverbs 
• PAST IT of a man: impotent ...M19 sl.
impotent - person
• APPLE-JOHN a foolish and probably impotent old man ...L16 sl.
• BROKEN ARROW a malfunctioning penis; hence, an impotent male ...1940s US sl.
• BUNGLER an impotent husband ...L17 sl.
• DOMINE DO-LITTLE an impotent old man ...L18 sl.
• DOMINI an impotent old man ...L18 sl.
• DOMINI DO-LITTLE, DOMINIE DO-LITTLE an impotent old man ...L18 sl.
• FLAT TIRE an impotent man; a worthless, powerless man ...E20 sl.
• GALLYWOW a man destitute of the power of begetting children ...Bk1900 Eng. dial.
• HANDYMAN an impotent man, or one who suffers from premature ejaculation ...Bk2004 Brit. sl.
• WILL-JILL a sterile or impotent person ...19C Eng. dial.
impotent - verbs
• DIE IN THE FURROW to copulate without ejaculating; to become impotent while copulating ​...19C Brit. sl.
• HAVE NO MORE INK IN THE PEN to be sexually exhausted from ejaculation; to be impotent from advanced age ...20C colloq.
• IMBECILE † to make imbecile, weak, or impotent; to impair, to weaken, to enfeeble, to debilitate ...1593-40
• MESS WITH NATURE to lose one's potency, esp. through excess use of narcotics or alcohol ...1970s US Black sl.
 
IMPOTENTLY - adverbs
• MAUGHTLESSLY feebly, impotently ...1880 Sc.
 
IMPOVERISH - person
• BEGGARER one who beggars or impoverishes ...1630
impoverish - verbs
• BEGGAR to impoverish; generally used of land ...Bk1898 Eng. dial.
• DEAD-BROKE to impoverish ...M19
• EMPOVER †* to impoverish, to make poor ...1474
• ERUMNATE † to impoverish, to make poor or miserable ...1692
• IMPOOR † to make poor; to impoverish ...1613
• TINSEL †* to subject to loss; to impoverish ...1475 Sc.
• UNCLEW to impoverish ...1607
• UNCLUE to impoverish ...1607
 
IMPOVERISHED - adjectives
• ASSED OUT defeated, out of luck, impoverished ...1980s US Black sl.
• BANG-UP impoverished, penniless ...M19 US sl.
• BEGGARED impoverished; reduced to destitution ...1599
• BROKEN penniless, out of funds, impoverished, poor ...M17 sl.
• DEADBEAT useless, ne'er-do-well, impoverished ...L19 sl.
• DOWN TO ONE'S SEAMS absolutely impoverished ...L19 US sl.
• FULL OF MONEY AS A TOAD IS OF FEATHERS, AS penniless, poor, impoverished ...B1900
• GUTTED impoverished; penniless; temporarily without cash ...c1820 sl.
• NOT A SIXPENCE TO SCRATCH ONE'S ARSE WITH absolutely impoverished, penniless ...M19 sl.
• ON ONE'S ABE impoverished ...1900s sl.
• OXY having a second-hand or dated appearance; impoverished-looking ...2003 UK sl.
• SALT unlucky, in a bad state; impoverished, empty-handed, low on food ...1950s W. Indies Rasta
• UNOOFY impoverished, poor ...L19 sl.
• UP A TREE impoverished ...M19 sl.
impoverished - person
• ALLEY RAT a particularly unpleasant, villainous, and impoverished person ...1910s sl.
• DEADBEAT of people: a failure, a down-and-out, an impoverished person; a person down on their luck; a jobless and homeless person ...M19 sl., orig. US
• DEAD-BROKER a down-and-out, an impoverished person ...L19 Aust. sl.
• DEAD ONE a useless, unsociable, impoverished, or mean person ...L19 US sl.
• DEATH'S HEAD a miserable, impoverished, emaciated person ...L18 sl.
• DEATH'S HEAD UPON A MOPSTICK a miserable, impoverished, emaciated person ...1794
• HARD-UP a hard-up, poor, destitute, or impoverished person ...1830 colloq.
• HAVE-NOTHING one who has nothing; a poor, impoverished, or destitute person; usually in plural ...1755 colloq.
• QUEER DUKE an impoverished gentleman ...L17 UK criminals' sl.
• RAG-ASS an impoverished person ...1990s US Black sl.
impoverished - verbs
• APPLY THE ACID to render impoverished ...1900s sl.
• FAIL UP to become impoverished; to go bankrupt ...1890 Amer. dial.
• PLY THE ACID to render impoverished ...1900s sl.
• PUT THE ACID ON to render impoverished ...1900s sl.
• SCRATCH A BEGGAR'S ASS to be impoverished ...1767 Amer. sl.
• TRY THE ACID to render impoverished ...1900s sl.
 
IMPOVERISHING - nouns
• SKINNING impoverishing, exhausting ...1888
 
IMPRACTICABILITY - nouns
• AWKWARDNESS perverseness, obstinacy, impracticability ...Bk1898 Eng. dial.
• AWKWARDS perverseness, obstinacy, impracticability ...Bk1898 Eng. dial.
 
IMPRACTICABLE - adjectives
• IMPRESTABLE † impracticable ...1683 Sc.
 
IMPRACTICAL - adjectives
• CRACKPOT crazily impractical ...1934 sl.
• WOOLLY-HEADED inclined to idealism and hopeful fantasy; impractical ...1883 Amer. sl.
 
IMPRESS - nouns
• YAVE † the power to inspire respect or fear; the ability to impress one's opinions or wills on others; the act of impressing with much earnestness ...1866 Sc.
impress - verbs 
• COME ON STRONG to try to create a strong impression ...1950s Amer. sl.
• DAZZLE SOMEONE WITH FOOTWORK to impress someone with facile virtuosity ...1980s Amer. sl.
• GET OFF ON THE WRONG FOOT to make a bad initial impression ...Bk1913-17 Amer. dial.
• MAKE A FANCY to make a good impression ...1936 Amer. dial.
• MAKE ONE'S MARBLE GOOD to make a good impression on a person, ingratiate oneself ...Aust. & NZ sl.
• ROCK to impress by wearing an item of clothing, or playing a musical instrument ...sl., chiefly US
• SCALE to impress; to astound ...1887 sl.
• WOW to impress someone powerfully and favourably ...1920s Amer. sl.
• YAVE † to overawe; to keep thoroughly in one's power; to impress strongly ...1866 Sc.

IMPRESSED - adjectives
• BLOWN AWAY greatly impressed; overwhelmed ...Bk2006 US sl.
• FRIGHTEN easily impressed ...1990s W. Indies sl.
impressed - verbs
• SHOOK ON to be keen on, to be impressed by, to admire ...1888 Aust. & NZ sl.

IMPRESSION (effect) - nouns
• FANCY a favourable impression ...1936 Amer. dial.
 
IMPRESSION (mark, etc.) - nouns
• ECTYPE † an impression in wax, clay, etc. of a seal or medal ...1662

IMPRESSIVE - adjectives
• ALMIGHTY great, impressive ...1824 UK
• BEAUTY large or impressive of its kind ...1895 Eng. dial.
• BONZER excellent, extremely good, first-rate; great, impressive; remarkable ...1901 Aust. sl.
• DANGEROUS extremely effective or impressive ...1984 US sl.
• EYE-FILLING visually impressive; extremely colourful, attractive, etc. ...1769
• EYEFUL * attractive or striking to the eye; visually impressive or pleasing ...1882
• EYE-GLUTTING visually impressive; extremely attractive, etc. ...1590
• EYE-POPPING surprising, astonishing, impressive; visually spectacular ...1918 orig. US
• HAIRY good, impressive ...1959 US sl.
• INBEARING † persuasive, eloquent, impressive ...1694 Sc.
• LARGE impressive, esp. in amount or degree ...1883 Amer. sl.
• MAJOR-LEAGUE impressive; formidable; significant; hence, a notable degree or amount of ...1941 Amer. sl.
• MONSTER excellent, very good; impressive, large, big, formidable ...1953 US sl., orig. Black usage
• NATION very large, very great; impressive ...1765 Eng. & Amer. dial.
• SHARP excellent, fine; impressive ...sl., orig. US
• SHOW-STOPPING impressive; sensational ...colloq.
• SLICK AS THE CAT'S WHISKERS excellent; impressive ...1926 US sl.
• SOCKO extremely impressive or successful ...1935 sl.
• SPLENDIOUS † splendid, very impressive, very good ...1609 
​• TEARING impressive, splendid, first-rate ...M17 sl.
• TEN-CARAT big; impressive; imposing ...Amer. sl.
• TEN FEET TALL hugely impressive; menacing ...1962 Amer. sl.
• WHAMBANG loud, large, and impressive ...1920s US
impressive - nouns
• BABY an impressive, large object ...1907 US sl.
• BAD BOY anything good or impressive ...1980s US Black sl.
• BIG BERTHA something unusually large or impressive ...1931 US sl.
• BIG BOY something that is a large, heavy, or impressive example of its kind ...1918 US sl.
• BONZER something very good, large, impressive, etc. of its kind ...1901 Aust. sl.
• BULGE † a very large or impressive thing; something important  ...1835 Amer. dial.
• BULGER † a very large or impressive thing ...1835 Amer. dial.
• DYNAMITE something that is very powerful or impressive ...1942 US sl.
• EYEFUL a striking or impressive sight ...1858
• HELL ON WHEELS anything regarded as a nasty, formidable, violent, or impressive situation or event ...1927 Amer. dial.
• HELL UPON WHEELS anything regarded as a nasty, formidable, violent, or impressive situation or event ...1843 Amer. dial.
• LIGHTNING STRIKER a formidable or impressive thing ...1867 US sl.
• NATION a great deal; a large number or amount; hence, an impressive example ...1762
• PEARLER an excellent thing; something impressive ...1935 sl., chiefly Aust.
• RATTLER something serious or impressive ...1847 sl.
​• SNORTER something outstandingly impressive or difficult ...Brit. sl.
• STONKER something which is very large or impressive of its kind ...1987 sl.
• WOWSER something very successful and impressive; a sensation ...1928 Amer. sl.
impressive - person
• FAIR HELL anyone who excels at something; an impressive person ...1934 US Black student sl.
• HELL anyone who excels at something; an impressive person ...1934 US Black student sl.
• HELL ON WHEELS a very impressive, nasty, or violent person ...1843 US sl.
• HER NIBS an important, impressive person ...1878 sl.
• HIS NIBS an important, impressive person ...1885 sl.
• MARVEL an impressive person; also used ironically ...1956 Aust. sl.
• MOBY DICK a large, important, or impressive man ...a1974
• WIG TIGHTENER someone very impressive ...Bk2000 hipster sl. 

IMPRISON - see PRISON
 
IMPROBABILITY - nouns
• INVERISIMILITUDE unlikelihood; improbability ...E19
 
IMPROBABLE - adjectives
• UNBEELIKE improbable ....1846 Sc.
• UNLIKE unlikely, improbable ...Bk1905 Eng. dial.
improbable - nouns 
• MARVELLOUS, THE that which is prodigious or extravagantly improbable ...1749
improbable - verbs 
• BACK UP A CAR LENGTH to be thus addressed signifies that your tale is improbable and should be modified ...1897 Amer. dial.
• TAKE THE CAKE to be highly improbable ...1960s sl.
 
IMPROMPTU - adjectives
• LARGE † of speech, etc.: free, unrestrained; in bad sense, lax, licentious, improper, gross ...c1374
• OFF-THE-CUFF with little or no preparation; extemporaneous; impromptu ...1940
• SUDDEN † done, performed, or prepared on the spur of the moment; extempore, impromptu ...1591
impromptu - verbs 
• RAP to have any form of impromptu dialogue ...1960s sl.