The term hot-tempered refers to someone who is easily agitated, irritable, or prone to anger. The antonyms of hot-tempered are words that describe individuals who are calm, collected, and capable of keeping their emotions in check. Some of the possible antonyms of hot-tempered include cool-headed, composed, patient, level-headed, unflappable, peaceful, mild-mannered, and easygoing. Such individuals can handle conflicts and stress without losing their temper, and they possess exceptional emotional intelligence. They remain balanced and mindful in all aspects of their lives, and they are always a pleasure to be around.