GNU Collaborative International Dictionary of English

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Found one definition

1.       
   jittery adj.  being in a tense state; easily upset or frightened; -- of a person.
   
   Syn. -- edgy, fidgety, high-strung, in suspense(predicate), jumpy, nervous, nervy, overstrung, restive, uneasy, uptight.
   
   [WordNet 1.5 +PJC]