Antonyms for the word "is infuriated" would be words or phrases that indicate the opposite emotion. Some possible antonyms include calm, tranquil, composed, peaceful, serene, relaxed, contented, and satisfied. These words all describe a state of emotional stability and tranquility, which is the opposite of being infuriated. Other antonyms may include happy, pleased, pleased, delighted, and joyful, as these emotions not only lack anger, but are also characterized by positive feelings of contentment and enjoyment. Regardless of the specific antonym used, the key idea is that the opposite emotion of being infuriated is one that is calm, content, and free of anger.