highly excitable; unnaturally or acutely uneasy or apprehensive: to become nervous under stress.
of or pertaining to the nerves: nervous tension.
affecting the nerves: nervous diseases.
suffering from, characterized by, or originating in disordered nerves.
characterized by or attended with acute uneasiness or apprehension: a nervous moment for us all.
having or containing nerves.
sinewy or strong.
Archaic. vigorous or spirited.

1350–1400; Middle English < Latin nervōsus sinewy, equivalent to nerv(us) nerve + -ōsus -ous

nervously, adverb
nervousness, noun
nonnervous, adjective
nonnervously, adverb
nonnervousness, noun
overnervous, adjective
overnervously, adverb
overnervousness, noun
seminervous, adjective
seminervously, adverb
seminervousness, noun
unnervous, adjective
unnervously, adverb
unnervousness, noun

1. fearful, timid, timorous.

1. confident, bold. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nervous (ˈnɜːvəs)
1.  very excitable or sensitive; highly strung
2.  (often foll by of) apprehensive or worried: I'm nervous of traffic
3.  of, relating to, or containing nerves; neural: nervous tissue
4.  affecting the nerves or nervous tissue: a nervous disease
5.  archaic active, vigorous, or forceful

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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Word Origin & History

c.1400, "affecting the sinews," from L. nervosus "sinewy, vigorous," from nervus "sinew, nerve" (see nerve). Sense of "of or belonging to the nerves" in the modern sense is from 1665. Meaning "suffering disorder of the nervous system" is from 1734; illogical sense "restless,
agitated, lacking nerve" is 1740. Widespread popular use as a euphemism for mental forced the medical community to coin neurological to replace it in the older sense. Nervous wreck first attested 1899.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

nervous nerv·ous (nûr'vəs)

  1. Of or relating to the nerves or nervous system.

  2. Stemming from or affecting the nerves or nervous system, as a disease.

  3. Easily agitated or distressed.

nerv'ous·ness n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
But underpinning the weakness is nervousness over the state of the public
  finances, given the crisis in banking.
Their unconsummated compliments leave their targets in a confused state of
  flattery, frustration and nervousness.
His nervousness is completely gone, his erratic behavior when it was time for
  him to go outside is completely gone.
Professional athletes and actors say some nervousness helps them concentrate
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