The antonyms for "being in huff" are calm, composed, cool, collected, relaxed, tranquil, and serene. These words describe a state of mind where one is not agitated, angry or frustrated. Calm implies a feeling of peace and tranquility, while composed describes someone who is in control of their emotions. Cool refers to someone who is unemotional and detached, while collected suggests someone who is in command of their thoughts and feelings. Relaxed implies a state of ease and freedom from stress, while tranquil and serene both describe a peaceful and calm state of mind. All these antonyms suggest a positive mental state, which can lead to better decision-making, improved relationships, and greater contentment in life.