Englishjittery
adjective informal
nervous, anxious, worried, apprehensive, on edge, edgy, tense, strained, stressed, agitated, in a state of nerves, in a state of agitation, uneasy, restless, worked up, keyed up, overwrought, wrought up, strung out, jumpy, on tenterhooks, with one's stomach in knots, fidgety, fearful, frightened, scared, with one's heart in one's mouth, like a cat on a hot tin roof, quaking, trembling, shaking, shaking in one's shoes, shaky, on pins and needles, in a cold sweat, fevered, febrile;
informal with butterflies in one's stomach, twitchy, in a state, uptight, wired, in a stew, all of a dither, all of a doodah, in a sweat, in a flap, in a tizz/tizzy, all of a lather, het up, in a twitter;
British, informal strung up, stressy, windy, having kittens, like a cat on hot bricks;
North American, informal spooky, squirrelly, in a twit;
Australian, New Zealand, informal toey;
British, vulgar slang shitting bricks, bricking oneself;
dated overstrung.
▷antonyms cool, calm, relaxed, laid-back.
jittery Oxford Dictionary of English