a. [ Compar. Jumpier superl. Jumpiest. ] Jumping, or inducing to jump; characterized by jumps; hence, extremely nervous; jittery. Syn. -- edgy, fidgety, high-strung, in suspense(predicate), jittery, nervous, nervy, overstrung, restive, uneasy, uptight. [ Webster 1913 Suppl. WordNet 1.5 ]