Prompted by the occasion rather than being planned in advance.adjective
Spoken, performed, done, or composed with little or no preparation; extemporaneous.adverb
With little or no preparation; extemporaneously.noun
Something, such as a speech, that is made or done extemporaneously.noun
A short composition, especially for the piano, performed in an offhand or extemporized style.
Prompt; offhand; extempore; extemporized for the occasion: as, an impromptu epigram.noun
Something said or written, played, etc., at the moment, or without previous study or preparation; an extemporaneous composition or performance.noun
In music: An extemporized composition; an improvisation.noun
A composition in irregular form, as if extemporized; a fantasia.
Offhand; without previous study or preparation: as, a verse written impromptu.