Coolheadedness is the state of being calm and composed. Some of the antonyms for coolheadedness would be agitation, excitement, frenzy, and panic. These words indicate a lack of control over one's emotions and actions. Other antonyms for coolheadedness are impetuosity, rashness, and recklessness. These words are often used to describe people who act without thinking things through, which can create chaotic or dangerous situations. Finally, impatience, irritability, and frustration are also antonyms for coolheadedness. These emotions are often associated with impulsive behavior, which can lead to poor decisions and negative consequences. It's important to recognize these antonyms for coolheadedness and strive to remain calm and level-headed in any situation.