Quick-tempered implies a person who becomes easily angered or irritated. The antonyms for the word quick-tempered can be described as calm, patient, and composed. A person who displays calmness is serene and imperturbable, meaning they can handle challenging situations without getting hot-headed. Someone who is patient is tolerant, stable, and understanding, displaying the ability to wait calmly in the face of tough times. Another antonym for quick-tempered is composed, a person who is self-controlled and level-headed, making rational decisions in stressful situations. Overall, these antonyms highlight how the opposite of quick-tempered traits are positive qualities that can bring peace and balance to a person's character.