Cool-headed is a term used to describe someone who remains calm and composed even in stressful or intense situations. The antonyms for cool-headed are hot-headed, impulsive, and irritable. A hot-headed person is quick to lose their temper and succumb to their emotions without careful consideration. Impulsive individuals don't take the time to think through their actions, leading to rash decisions that may cause regret later. Irritable people are easily provoked and can react sharply with little provocation. These antonyms for cool-headed indicate a lack of control over one's emotions and actions, making it difficult to handle stress and challenging situations effectively.