Basketcase is a slang term used to describe a person who is perceived as being mentally or emotionally unstable. Antonyms for this word would include "stable", "composed", "well-adjusted", "balanced", "sane", "logical", and "rational". These antonyms describe individuals who are emotionally secure, have a sound mind, and are able to maintain their composure under stress or difficult circumstances. They may have good coping skills or a strong support system that helps them navigate life's challenges. While the word "basketcase" may be used derogatorily, its antonyms are positive attributes that reflect strength, resilience, and emotional well-being.