improvised, adj. unprepared, unpremeditated, unrehearsed, unprompted; extemporized, extempore, adlib, Sl. off-the-cuff, offhand; makeshift, jury-rigged, strung-together.
2. spontaneous, spur-of-the-moment, last-minute, impulsive, impetuous; potluck, catch-as-catch-can.
imprudence, n. indiscretion, inconsiderateness, thoughtlessness, irresponsibility; inexpedience, injudiciousness, impoliticness; incaution, incautiousness, carelessness, recklessness, temerity, foolishness, folly; foolhardiness, rashness, hotheadedness, brashness, unwariness, unguardedness; impulsiveness, hastiness, short-sightedness, heedlessness.
imprudent, adj. 1. indiscreet, inconsiderate, thoughtless, irresponsible, incautious, foolish; injudicious, ill-judged, inexpedient, unwise, ill-advised, unadvised, ill-considered, ill-suited, impolitic; guided, wrong-headed, perverse.
2. impetuous, impulsive, hasty, over-hasty, shortsighted, heedless, unheeding; foolhardy, headlong, breakneck, hazardous; rash, hotheaded, brash, unwary, unguarded; uncircumspect, careless, reckless, harebrained, madcap, temerarious, wild; spontaneous, unpremeditated, sudden, abrupt, precipitate.
impudence, n. 1. impertinence, insolence, audacity, effrontery, presumption, presumptuousness; boldness, brazenness, pertness, brashness, freshness, sauciness, shamelessness, Inf. cheekiness, Inf. sassiness, Inf. brassiness; impoliteness, disrespect, unmannerliness, ill-manneredness, incivility, rudeness; bumptiousness, cockiness, self-assertiveness or self-assertion, chutzpah, forwardness; meddlesomeness, intrusiveness, officiousness.
2. All Inf. brass, sass, cheek, guff, back talk, sauce, face, crust; All Sl. gall, nerve, lip, mouth, Brit. side.
impudent, adj. impertinent, insolent, audacious, presumptuous, out-of-line, out-of-keeping; bold, brazen, brazen-faced, brash, fresh, pert, saucy, shameless, Inf. flip, Inf. cheeky, Inf. sassy, Inf. brassy, Sl. wise, Sl. mouthy, Sl. smart-mouth; impolite, disrespectful, ill-mannered, unmannerly, unmannered, uncivil, ill-bred, rude, crude, coarse, vulgar; bumptious, cocksure, cocky, arrogant, forward; meddlesome, intrusive, officious.
impugn, v. 1. malign, gibbet, vilify, vituperate, vilipend, run down, defame, denigrate, scandalize, asperse, impute, insinuate, cast aspersions, speak ill of, speak evil of, backbite, Sl. badmouth, Sl. poor-mouth; slander, libel, calumniate, traduce, falsify, accuse falsely, misrepresent, belie; attack, assail, stab, injure, abuse, berate, upbraid, castigate, reprimand, scold, chide, admonish, rebuke; criticize, knock, carp at, cavil at, peck at; denounce, deplore, curse, rail, condemn, execrate, anathematize, Obs. exprobrate.
2. censure, reproach, impeach, bring to book, call to account, accuse, charge, cry down, slate, inveigh against, perstringe, animadvert upon, reprove, recriminate, reprehend, reprobate, pass strictures; disapprove, disfavor, dislike, frown upon, look askance; doubt, query, question, disbelieve, misbelieve, distrust, mistrust; challenge, dispute, argue, wrangle, haggle, hassle, altercate, oppose, object to, protest, enter a protest, conflict with, take exception to, join issue upon; deny, disprove, gainsay, rebut, contradict, contravene, controvert, pick holes in, pick to pieces.
impulse, n. 1. impetus, propulsion, send-off, goad, spur, force, stimulus, stimulation, incitement; incentive, motive, inducement, encouragement, boost.