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

[ Syn: ad-lib , extemporaneous , extemporary , extempore , impromptu , offhand , offhanded , off-the-cuff ]