Antonyms for the word "most unanxious" are a set of words that convey the opposite meaning of the term. The term "most unanxious" suggests that a person is calm and devoid of anxiety. The antonyms for this term would be words that imply that an individual is highly anxious, nervous, or tense. A few antonyms that come to mind include stressed, worried, panicky, and anxious. These words are often used to describe someone who is highly anxious or stressed out. While "most unanxious" may indicate a state of relaxation, its antonyms imply an agitated and stressful state of being.