"jumpy" in the adjective sense
1. edgy, high-strung, highly strung, jittery, jumpy, nervy, overstrung, restive, uptight
being in a tense state
2. rough, rocky, bumpy, jolty, jolting, jumpy
causing or characterized by jolts and irregular movements
"a rough ride"
Source: WordNet® (An amazing lexical database of English)
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