Adjective
1. 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"2. casually thoughtless or inconsiderate;
"an offhand manner""she treated most men with offhand contempt"