The word "over-emotional" signifies excessive emotions, making one vulnerable to sentimentality and irrationality. Its antonyms are words that represent emotional restraint, calmness, and level-headedness. Phrases such as "stoic," "unemotional," "unflappable," "reserved," and "detached" are excellent antonyms for over-emotional. These words portray a sense of composure and stability, allowing one to approach situations from a place of logic, rather than react impulsively based on one's feelings. A person who is not over-emotional is more likely to handle tough circumstances with poise and wisdom, mitigating the effects of stressful events.