The antonyms of unpoised are composed, calm, tranquil, serene, collected, self-possessed, assured, and confident. Composed means having control over one's emotions, whereas calm refers to a state of peacefulness and quietness. Tranquil means a peaceful and relaxed atmosphere. Serene means a state of calmness and peace. Collected means having control over one's emotions, and self-possessed means confident and composed. Assured and confident are synonyms that suggest someone is in control and prepared. These opposites of unpoised describe individuals who are cool-headed, confident, and relaxed in their behavior, demeanor, and decision-making.