adjective, snap·pi·er, snap·pi·est.
- apt to snap or bite; snappish, as a dog.
- impatient or irritable, as a person or a reply.
- snapping or crackling in sound, as a fire.
- quick or sudden in action or performance.
- Informal. crisp, smart, lively, brisk, etc.: Only snappy people get ahead in this world.