Causing anxiety, fear, or loss of confidence; disturbing in a way that affects one's composure. Making someone feel unsettled or shaken.
From 'nerve' in the sense of courage or self-control, with the prefix 'un-' indicating removal. The verb 'unnerve' appeared in the 17th century, meaning to deprive of strength or resolution, with the adjective form following later.
The word plays on 'nerve' meaning courage - to 'unnerve' someone is literally to strip away their nerve or bravery. It's fascinating how we use body parts metaphorically for emotions: we lose our nerve, steel our nerves, or have nerves of steel.
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