jittery

[jit-uh-ree]
adjective, jitterier, jitteriest.
extremely tense and nervous; jumpy: He's very jittery about the medical checkup.

Origin:
1930–35, Americanism; jitter + -y1

jitteriness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
jittery (ˈdʒɪtərɪ)
 
adj
informal nervous and anxious
 
'jitteriness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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