adjective, jitterier, jitteriest.
extremely tense and nervous; jumpy: He's very jittery about the medical checkup.

1930–35, Americanism; jitter + -y1

jitteriness, noun
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World English Dictionary
jittery (ˈdʒɪtərɪ)
informal nervous and anxious

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Eating or drinking a large amount of caffeine can make you feel jittery,
  nervous, or energetic.
Our companions grow jittery, and an awkward silence falls.
In fact, environmental cues can exacerbate any innate tendency to use food as a
  balm for jittery nerves or sadness.
And no matter how many cups a day it samples, the mechanized coffee taster will
  never get jittery.
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