The phrase "out of one's tree" often means that someone is behaving irrationally, or is simply losing their mind. Antonyms for this phrase, which would indicate the opposite meaning or intention, could include "compos mentis," "sane," "logical," or "rational." These terms describe someone who is fully in control of their thoughts and actions, and is making sound choices based on clear, thoughtful reasoning. By contrast, the phrase "out of one's tree" suggests that someone is acting impulsively, without regard for consequences, and may not be thinking clearly or reasonably. As such, using antonyms for this phrase can help to convey a sense of stability, reason, and common sense.
