adjective, jump·i·er, jump·i·est.

  1. subject to sudden, involuntary starts, especially from nervousness, fear, excitement, etc.
  2. characterized by sudden starts, jerks, or jumps: a jumpy narrative.

adjective jumpier or jumpiest

  1. nervous or apprehensive
  2. moving jerkily or fitfully

“nervous,” 1869, from jump (n.) + -y (2). Related: Jumpiness.

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