- made or done without previous preparation: an impromptu address to the unexpected crowds.
- suddenly or hastily prepared, made, etc.: an impromptu dinner.
- improvised; having the character of an improvisation.
- without preparation: verses written impromptu.
- something impromptu; an impromptu speech, musical composition, performance, etc.
- a character piece for piano common in the 19th century and having, despite its title, a clear-cut form.
- unrehearsed; spontaneous; extempore
- produced or done without care or planning; improvised
- in a spontaneous or improvised wayhe spoke impromptu
- something that is impromptu
- a short piece of instrumental music, sometimes improvisatory in character
1660s (adv.), 1764 (adj.), from French impromptu (1650s), from Latin in promptu “in readiness,” from assimilated form of in- “into, in, on, upon” (see in- (2)) + promptu, ablative of promptus “readiness,” from past participle of promere “to bring out,” from pro- “before, forward, for” + emere “to obtain” (see exempt).