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unnerve

[uhn-nurv]
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verb (used with object), un·nerved, un·nerv·ing.
  1. to deprive of courage, strength, determination, or confidence; upset: Fear unnerved him.

Origin of unnerve

First recorded in 1595–1605; un-2 + nerve
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for unnerve

unnerve

verb
  1. (tr) to cause to lose courage, strength, confidence, self-control, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unnerve

v.

1620s, "to destroy the strength of," from un- (2) + nerve. Meaning "to deprive of courage" is recorded from 1704. Related: Unnerved; unnerving.

Online Etymology Dictionary, © 2010 Douglas Harper