unnerve   
  un‧nerve /ʌnˈnɜːv $ -ɜːrv/ BrE  AmE  verb [transitive]    [Word Family: adjective: ↑nervous, ↑nerveless, ↑nerve-racking, ↑nervy, ↑unnerving; noun: ↑nerve, nerves, ↑nervousness; verb: ↑nerve, ↑unnerve; adverb: ↑nervously]    to upset or frighten someone so that they lose their confidence or their ability to think clearly:         He was unnerved by the way Sylvia kept staring at him.   —unnerving adjective:         an unnerving experience
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