When it comes to finding synonyms for the phrase "be at ease", there are plenty of choices available. A few options could include "relax", "unwind", "take it easy", "chill out", "remain calm", "be comfortable", "feel relaxed", "settle down", "let go", and "take a breather". Each of these phrases communicate the idea of being in a state of peace, comfort, or tranquility, and allow for a sense of letting go or releasing stress. Whether in conversation or in writing, using these synonyms can help add variation and interest to descriptions or conversations about being relaxed or comfortable.