N. impulse, sudden thought, impromptu, improvisation, inspiration, flash, spurt, improvisatore, creature of impulse

V. flash on the mind, say what comes uppermost, improvise, extemporize

Adj. extemporaneous, impulsive, indeliberate, snap, improvised, improvisate, improvisatory, unpremeditated, unmeditated, improvise, unprompted, unguided, natural, unguarded, spontaneous, instinctive

Adv. extempore, extemporaneously, offhand, impromptu, a limproviste, improviso, on the spur of the moment, on the spur of the occasion

N. chance, lot, fate, luck, good luck, mascot, speculation, venture, stake, game of chance, mere shot, random shot, blind bargain, leap in the dark, pig in a poke, fluke, potluck, faro bank, flyer*, limit, uncertainty, uncertainty principle, heisenberg's uncertainty principle, drawing lots, sortilegy, sortition|, sortes, sortes virgilianae, rouge et noir, hazard, ante, chuck-a-luck, crack-loo, craps, faro, roulette, pitch and toss, chuck, farthing, cup tossing, heads or tails cross and pile, poker-dice, wager, bet, betting, gambling, the turf, gaming house, gambling house, betting house, bucket shop, gambling joint, totalizator, totalizer, hell, betting ring, dice, dice box, gambler, gamester, man of the turf, adventurer, dicer|

V. chance, stand a chance, toss up, cast lots, draw lots, leave to chance, trust to chance, leave to the chapter of accidents, trust to the chapter of accidents, tempt fortune, chance it, take one's chance, take a shot at it (attempt) 675, run the risk, run the chance, incur the risk, incur the chance, encounter the risk, encounter the chance, stand the hazard of the die, speculate, try one's luck, set on a cast, raffle, put into a lottery, buy a pig in a poke, shuffle the cards, risk, venture, hazard, stake, ante, lay, lay a wager, make a bet, wager, bet, gamble, game, play for, play at chuck farthing

Adj. fortuitous, unintentional, unintended, accidental, not meant, undesigned, purposed, unpremeditated, unforeseen, uncontemplated, never thought of, random, indiscriminate, promiscuous, undirected, aimless, driftless, designless, purposeless, causeless, without purpose, possible, unforeseeable, unpredictable, chancy, risky, speculative, dicey

Adv. randomly, by chance, fortuitously, unpredictably, unforeseeably, casually, unintentionally, unwittingly, en passant, by the way, incidentally, as it may happen, at random, at a venture, at haphazard

Phr. acierta errando, dextro tempore, "fearful concatenation of circumstances", "fortuitous combination of circumstances", le jeu est le fils d'avarice et le pere du desespoir, "the happy combination of fortuitous circumstances", "the fortuitous or casual concourse of atoms", "god does not play dice with the universe"

N. non-preparation, absence of preparation, want of preparation, inculture|, inconcoction|, improvidence, immaturity, crudity, rawness, abortion, disqualification, nature, state of nature, virgin soil, unweeded garden, neglect, rough copy, germ, raw material, improvisation

V. be unprepared, want preparation, lack preparation, lie fallow, s'embarquer sans biscuits, live from hand to mouth, dismantle, undress, extemporize, improvise, ad lib

Adj. unprepared &c, without preparation, incomplete, rudimental, embryonic, abortive, immature, unripe, kachcha, raw, green, crude, coarse, rough cast, rough hewn, in the rough, unhewn, unformed, unfashioned, unwrought, unlabored, unblown, uncooked, unboiled, unconcocted, unpolished, unhatched, unfledged, unnurtured, unlicked, untaught, uneducated, uncultivated, untrained, untutored, undrilled, unexercised, deckle-edged, precocious, premature, undigested, indigested, unmellowed, unseasoned, unleavened, unrehearsed, unscripted, extemporaneous, improvised, spontaneous, ad lib, ad libitem, fallow, unsown, untilled, natural, in a state of nature, undressed, in dishabille, en deshabille, unqualified, disqualified, unfitted, ill-digested, unbegun, unready, unarranged, unorganized, unfurnished, unprovided, unequipped, untrimmed, out of gear, out of order, dismantled, shiftless, improvident, unthrifty, thriftless, thoughtless, unguarded, happy-go-lucky, caught napping, unpremeditated

Adv. extempore