The word "un-nerve" can mean to make someone nervous or anxious. Antonyms of "un-nerve" would include words such as comfort, relax, encourage, and soothe. Comfort means to provide consolation and support to someone who is distressed or upset. Relax means to become less tense or anxious and to calm down. Encourage means to give someone confidence or hope. Soothe means to mitigate or alleviate pain or discomfort. These antonyms can be useful when dealing with someone who is feeling nervous or anxious and needs support or reassurance. By using these words, we can help people feel more comfortable and confident, and ease their worries.