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impromptu

adverb
  1. without advance preparation
    ad lib
adjective
  1. with little or no preparation or forethought
    offhandoffhandedextemporead-libextemporaneousextemporaryoff-the-cuffunrehearsed
noun
  1. an extemporaneous speech or remark
    “a witty impromptu must not sound premeditated”
  2. a short musical passage that seems to have been made spontaneously without advance preparation