Unnerve is defined as to cause fear or loss of confidence.
An example of unnerve is to convince someone that she is not smart enough for a particular job.
- to cause to lose one's courage, self-confidence, etc.
- to make feel weak, nervous, etc.
transitive verbun·nerved, un·nerv·ing, un·nerves
To cause to lose courage or firmness of purpose: “It unnerved him to think that she would be at the supper-table, looking up at him while he spoke with her critical quizzing eyes” (James Joyce).