impromptu

Noun
  1. An extemporaneous speech or remark (synset 107254448)
    "a witty impromptu must not sound premeditated"
    is a type of: address, speech - the act of delivering a formal spoken communication to an audience
  2. A short musical passage that seems to have been made spontaneously without advance preparation (synset 107254587)
    is a type of: musical passage, passage - a short section of a musical composition
Adverb
  1. Without advance preparation (synset 400089143)
    "he spoke ad lib"
    same as: ad lib, ad libitum, spontaneously
Adjective
  1. With little or no preparation or forethought (synset 301851375)
    "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"
    similar to: unprepared - without preparation; not prepared for
    same as: ad-lib, extemporaneous, extemporary, extempore, off-the-cuff, offhand, offhanded, unrehearsed

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