When someone is "out of their mind," they are usually behaving in an irrational or insane way. Antonyms for this phrase would include "level-headed," "sane," "reasonable," "logical," "sensible," "rational," and "balanced." These words all suggest that someone is thinking clearly and acting calmly. Other antonyms could include "compos mentis," "in control," "together," "collected," and "sober-minded." Essentially, any word that suggests a person's mental state is stable and rational would be an antonym for "out of one's mind." It is important to remember that mental health is a complex issue that cannot be defined by a single phrase, and people experiencing mental illness should receive support and compassion.
