Synonyms for Jumpy (same or very similar meaning)
WordNet sense 1 (being in a tense state):
edgy, high-strung, jittery, nervy, overstrung, restive, uptight, highly strungWordNet sense 2 (in or of a state of physical or nervous tension):
tenseWordNet sense 3 (causing or characterized by jolts and irregular movements):
bumpy, rocky, rough, jolting, joltyFrom the ODE community, based on WordNetadd/edit