verb (used with object), unnerved, unnerving.
to deprive of courage, strength, determination, or confidence; upset: Fear unnerved him.

1595–1605; un-2 + nerve

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World English Dictionary
unnerve (ʌnˈnɜːv)
(tr) to cause to lose courage, strength, confidence, self-control, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1621, "to destroy the strength of," from un- (2) + nerve. Meaning "to deprive of courage" is recorded from 1704.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Burning churches, and the perceived danger of worsening violence, will unnerve
  foreign investors and tourists.
The final piece of the plan may unnerve some taxpayers.
But note that silence can also be used to unnerve a negotiating opponent.
They would unnerve their tormentors even in the midst of their sufferings by
  seeking to convert them.
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