Adjective
1. said or done without having been planned or written in advance;
"he made a few ad-lib remarks"2. 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"