Impromptu
WordNet
adjective
(1) With little or no preparation or forethought
"His ad-lib comments showed poor judgment"
"An extemporaneous piano recital"
"An extemporary lecture"
"An extempore skit"
"An impromptu speech"
"Offhand excuses"
"Trying to sound offhanded and reassuring"
"An off-the-cuff toast"
"A few unrehearsed comments"
adverb
(2) Without advance preparation
"He spoke ad lib"
noun
(3) An extemporaneous speech or remark
"A witty impromptu must not sound premeditated"
(4) A short musical passage that seems to have been made spontaneously without advance preparation
WiktionaryText
Etymology
From , from + .
Adjective
- Improvised; without prior preparation; extemporaneous; unplanned.
- The party began with an impromptu rendition of 'Happy Birthday'.
Noun
- a short musical composition for an informal occasion often with the character of improvisation and usually to be played solo.