impromptu(noun) an extemporaneous speech or remark; "a witty impromptu must not sound premeditated"
(noun) a short musical passage that seems to have been made spontaneously without advance preparation
(adjective satellite) 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
(adverb) without advance preparation; "he spoke ad lib"
Source:
WordNet 2.0 Copyright 2003 by Princeton University. All rights reserved.
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