The phrase "blew a fuse" conveys the idea of becoming extremely agitated, frustrated or angry. However, there are many antonyms for this expression that reflect a more positive or relaxed state of being. Some antonyms for "blew a fuse" could include "calm", "serene", "collected", "controlled", "composed", "peaceful", "tranquil", "unruffled", and "cool-headed". These words denote a sense of emotional stability, control and composure, which are crucial in maintaining healthy relationships and managing stressful situations. Using antonyms in place of "blew a fuse" can help to promote positive communication and understanding in various social and professional scenarios.