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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

1. With little or no preparation or forethought
   "an impromptu speech"
   - ad-lib, extemporaneous, extemporary, extempore, offhand, offhanded, off-the-cuff, unrehearsed

1. Without advance preparation
   - ad lib, ad libitum, spontaneously

Derived forms: impromptus

See also: unprepared

Type of: address, musical passage, passage, speech

Encyclopedia: Impromptu