Etymology
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unnerve (v.)

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

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Definitions of unnerve

unnerve (v.)
disturb the composure of;
Synonyms: faze / enervate / unsettle
From wordnet.princeton.edu