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

1865–70; jump + -y1

jumpily, adverb
jumpiness, noun

1. jittery, skittish, fidgety.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
jumpy (ˈdʒʌmpɪ)
adj , jumpier, jumpiest
1.  nervous or apprehensive
2.  moving jerkily or fitfully

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The patient has verbalized that she is somewhat nervous and jumpy but denies
  any unusual activity or stress.
The defendant appeared to be extremely jumpy and nervous and was sweating
At the subatomic scale, where the universe is jumpy and discontinuous,
  physicists don't know how gravity behaves.
The mood on the border had been growing increasingly jumpy of late.
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