1. (

• impromptu

) an extemporaneous speech or remark; "a witty impromptu must not sound premeditated" ;

2. (

• impromptu ,

) a short musical passage that seems to have been made spontaneously without advance preparation ;

1. (

• ad-lib ,
• extemporaneous ,
• extemporary ,
• extempore ,
• impromptu ,
• offhand ,
• offhanded ,
• off-the-cuff ,
• unrehearsed

) 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"; "an off-the-cuff toast"; "a few unrehearsed comments" ;

1. (

• ad_lib ,
• ad_libitum ,
• spontaneously ,
• impromptu

) without advance preparation; "he spoke ad lib" ;