Tetchiness is the state of being irritable or easily annoyed. Some common antonyms for tetchiness are calmness, serenity, amicability, and equanimity. Calmness refers to the state of being tranquil or peaceful in temperament, while serenity is a state of being calm and untroubled. Amicability refers to a disposition that is friendly and cordial, and equanimity indicates emotional balance and stability. Other antonyms for tetchiness include poise, composure, diplomacy, and affability. These antonyms suggest an overall positive demeanor that is pleasant, easy-going, and agreeable, in contrast to the negative behavior associated with tetchiness.