Antonyms for the word "bite one's nails" would be staying calm, relaxed, and composed. Instead of feeling anxious or nervous, one could feel confident and collected. Some other antonyms could be indulging in a stress-relieving activity, such as exercise, reading, or meditation. A person who is not "biting their nails" may be focused on positive thoughts and an optimistic outlook towards the future. They would not be nervous, fidgeting or frowning, but rather they would be smiling, standing tall with a sense of assurance. Overall, it is important to find ways to release stress and anxiety instead of resorting to "biting one's nails.