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From The Collaborative International Dictionary of English v.0.48:
jittery \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]