The phrase "blown a gasket" typically refers to a person becoming extremely angry or losing control of their emotions. Antonyms for this phrase could include "calm," "composed," "unbothered," or "unfazed." Someone who has not "blown a gasket" would likely be described as level-headed, relaxed, or in control of their emotions. Other antonyms could include peaceful, serene, tranquil, or placid. To avoid blowing a gasket, it may be helpful to practice mindfulness, deep breathing, or other relaxation techniques. Additionally, effective communication and problem-solving skills can help prevent situations from escalating to the point of losing control.