Most fuming is a term that refers to extreme anger or frustration. Antonyms for this term would include words that describe the opposite emotions or states of being. Some related antonyms could include the words calm, peaceful, content, happy, or relaxed. These are all words that express a sense of tranquility or serenity, which stands in stark contrast to the overwhelming emotions associated with most fuming. By using opposites in this way, a writer or speaker can create a balance of emotional contrasts, and convey a more nuanced understanding of the human psyche.