More maniac refers to an individual who displays an excessive and irrational amount of enthusiasm, passion or odd behavior. Antonyms for more maniac include calm, composed or rational. A person who is calm is self-controlled, not agitated, and able to keep their emotions in check, while a person who is composed is collected, steady and poised. Rationality means being sensible, reasonable, and capable of making sound decisions. It is therefore essential to practice self-control and avoid extreme behaviors to portray calmness, rationality, and composure, which are the opposite of being a more maniac person.