The phrase "are a huff" implies that someone is angry or in a bad mood. Antonyms for this phrase would include words that describe someone who is calm, content, or happy. For example, some antonyms for "are a huff" might include phrases like "at ease," "pleased as punch," or "in good spirits." Other related words might include "relaxed," "peaceful," or "contented." When we use these antonyms to describe someone's mood, we are implying that they are not upset or angry, and are instead feeling positive and in control.