Antonyms for the phrase "most flipped out" are words that convey calmness, composure, and sanity. Some of the antonyms for this phrase are cool, composed, collected, serene, and tranquil. These words describe a state of mind that is free from anxiety, anger, or excitement. Being cool, composed, or tranquil means being in control of one's emotions and acting rationally. In contrast, the phrase most flipped out implies losing control, being agitated, or being in a state of extreme anxiety or panic. It is important to keep a calm and composed demeanor to deal with any situation effectively and efficiently.