The term "havethrow a fit" is an idiomatic expression that means to become extremely angry and lose control over one's emotions. There are several antonyms, or opposite words, that can be used to describe the opposite of "havethrow a fit." These antonyms include staying calm, keeping one's composure, remaining levelheaded, and maintaining self-control. Other antonyms for "havethrow a fit" include displaying restraint, exhibiting patience, demonstrating tolerance, and being understanding. By using these antonyms, one can convey the opposite meaning of "havethrow a fit," and demonstrate the importance of staying cool, collected, and rational, even in emotionally charged situations.