(adj) with little or no preparation or forethought, Syn. extemporary, unrehearsed, extemporaneous, offhanded, extempore, offhand, impromptu, off-the-cuff, Example: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