Unnerve – Make (someone) lose courage or confidence
The fact that he only wore underwear got on everyone's nerves (unnerve). As a result, they lost confidence in him as a leader.
Examples of unnerve in a sentence
The spiders in the attic really unnerve me, I don't want to go up there.
In an effort to unnerve the rival team, the New Zealand All Blacks performed their traditional Haka.
Her angry expression didn't unnerve me.