'Jumpiest' definitions:

Definition of 'Jumpiest'

From: GCIDE

Jumpy \Jump"y\, a. [Compar. Jumpier; superl. Jumpiest.] Jumping, or inducing to jump; characterized by jumps; hence, extremely nervous; jittery.
Syn: edgy, fidgety, high-strung, in suspense(predicate), jittery, nervous, nervy, overstrung, restive, uneasy, uptight. [Webster 1913 Suppl. WordNet 1.5]