Unnerve - Definition, Meaning & Synonyms

To unnerve someone is to make them feel scared or confused. Haunted houses are meant to unnerve you — though there may be nothing that unnerves you more than the first day at a new school.
The original meaning of unnerve, dating back to the 17th century, was to destroy the strength of. The source of this definition was a now-obsolete meaning of nerve, to give strength and vigor. Today when you unnerve someone, instead of destroying their strength, you destroy their composure — in other words, you make them nervous or uncertain.

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