jumpy /ˈʤʌmpi/
  (a.)跳躍的,跳動的,神經質的
  Jump·y 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.
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  jumpy
       adj : being in a tense state [syn: edgy, high-strung, highly
             strung, in suspense(p), jittery, nervy, overstrung,
              restive, uptight]
       [also: jumpiest, jumpier]