The antonyms of calm and collected are agitated and discomposed. If someone is agitated, they are feeling nervous and restless, and their behavior is frenzied and excitable. On the other hand, discomposed means a state of being disturbed or upset, which often leads to confusion and chaos in one's thoughts and behavior. People who are agitated and discomposed have a hard time keeping their emotions under control, and they can quickly become overwhelmed in stressful situations. They may act out in a way that is detrimental to their mental and physical health, making it essential to find ways to calm themselves down and regain their composure.