impromptu

Main Entry:
sudden [suhd-n]
Part of Speech: adjective
Definition: unexpected; happening quickly
Synonyms: abrupt, accelerated, acute, expeditious, fast, flash, fleet, hasty, headlong, hurried, immediate, impetuous, impromptu, impulsive, out of the blue, precipitant, precipitate, precipitous, quick, quickened, rapid, rash, rushing, spasmodic, speeded, subito, swift, unforeseen, unusual
Antonyms: expected, slow
Main Entry: unrehearsed
Part of Speech: adjective
Definition: spontaneous
Synonyms: ad-lib, extemporaneous, from the hip, impromptu, improvised, impulsive, not rehearsed, off the cuff, off the top of one's head, spur of the moment, unpracticed, unprepared
Main Entry: pickup
Part of Speech: noun
Definition: boost
Synonyms: acceleration, impromptu, stimulant
Main Entry: extempore
Part of Speech: adjective
Definition: offhand
Synonyms: extemporaneous, impromptu
Notes: impromptu conveys unrehearsed remarks or performance with an element of surprise, while extempore only suggests that this is done without notes or props
Main Entry: ad libitum
Part of Speech: adjective, adverb
Definition: at one's pleasure
Synonyms: according to pleasure, ad-lib, as one thinks best, as one wishes, at will, extemporaneous, freely, impromptu, improvised, impulsive, made-up, off-the-cuff, offhand, spontaneously, unrehearsed, without restraint
Main Entry: extemporaneous
Part of Speech: adjective
Definition: improvised
Synonyms: ad hoc, ad-lib, automatic, autoschediastic, by ear, casual, expedient, extemporary, extempore, fake, free, immediate, impromptu, improv, improvisatory, improviso, informal, jamming, made-up, makeshift, offhand, on impulse, on-the-spot, snap, spontaneous, spur-of-the-moment, toss off, toss out, unplanned, unpremeditated, unprepared, unrehearsed, unstudied, winging it
Notes: extemporaneous means 'prepared in advance and carried out with few or no notes' while impromptu means 'totally unprepared, performed on the spur of the moment' - but this distinction has been all but lost
Antonyms: deliberate, planned, premeditated, prepared, rehearsed
Main Entry: off the cuff
Part of Speech: adjective, adverb
Definition: without preparation
Synonyms: ad-lib, by ear, extemporaneously, impromptu, improv, improvised, makeshift, off the hip, off the top of one's head, offhand, spur of the moment, unrehearsed
Main Entry: spontaneously
Part of Speech: adverb
Definition: instinctively
Synonyms: ad-lib, automatically, extemporaneously, immediately, impromptu, impulsively, unconsciously
Main Entry: unplanned
Part of Speech: adjective
Definition: not planned
Synonyms: accidental, adventitious, aleatory, fortuitous, haphazard, impromptu, random, spontaneous, undesigned, unexpected, unintended, unintentional
Antonyms: planned
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