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jumpy (adj.)

"nervous," 1869, from jump (n.) in a sense "sudden involuntary movement" + -y (2). Related: Jumpiness. The jumps "state of nervous excitement" is from 1872.

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Definitions of jumpy

jumpy (adj.)
being in a tense state;
Synonyms: edgy / high-strung / highly strung / jittery / nervy / overstrung / restive / uptight
jumpy (adj.)
causing or characterized by jolts and irregular movements;
Synonyms: rough / rocky / bumpy / jolty / jolting
From wordnet.princeton.edu