Synonyms for impromptu

Noun

1. impromptu, address, speech

usage: an extemporaneous speech or remark; "a witty impromptu must not sound premeditated"

2. impromptu, passage, musical passage

usage: a short musical passage that seems to have been made spontaneously without advance preparation

Adjective

1. ad-lib, extemporaneous, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed, unprepared (vs. prepared)

usage: 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

1. ad lib, ad libitum, spontaneously, impromptu

usage: without advance preparation; "he spoke ad lib"