The antonyms for "composed oneself" are generally words and phrases that refer to negative emotions or states of mind. They include agitated, anxious, hysterical, frazzled, flustered, disturbed, perturbed, and unnerved. When someone has not composed themselves, they may have trouble thinking clearly and making rational decisions. This can lead to impulsive behavior, heightened emotions, and difficulty communicating effectively. In contrast, when someone has composed themselves, they are able to take a step back from their emotions, think objectively, and act calmly and thoughtfully. This is a valuable skill in many situations, from work to personal relationships.