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

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
   "The pianist delighted the audience with a charming impromptu"

1. Without advance preparation
   "he spoke impromptu";
   - ad lib, ad libitum, spontaneously

Derived forms: impromptus

See also: ill-prepared, unprepared

Type of: address, musical passage, passage, speech

Encyclopedia: Impromptu