GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Jumpy (?), 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]