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, impromptu, offhand, offhanded, off-the-cuff, unrehearsed • Similar to: unprepared