jittery Definition

jitter (colloq)
verb

intr
jittered, jittering
1. To shake with nerves; to behave in a flustered way.

noun

1. An attack of nervousness.

Example: He's got the jitters
Thesaurus: nerves, fidgets, tenseness, anxiety, the creeps (slang), the shakes (slang), the shivers (slang), the willies (slang).
Form: the jitters (usually)

Derivative: jitteriness
noun

Derivative: jittery
adj

Nervous or flustered
Thesaurus: nervous, panicky, perturbed, agitated, anxious, edgy, flustered, jumpy, shaky, uneasy; Antonym: calm, composed, confident.

Etymology: 20c: variant of dialect and Scots chitter to shiver.