Antonyms for the word "most messed-up" include "organized," "tidy," and "well-kept." These terms imply a sense of order, cleanliness, and neatness, rather than disarray or disorder. Other antonyms for "most messed-up" might include "systematic," "methodical," and "efficient," which all suggest a structured approach to organizing and managing different aspects of life or work. Additionally, "calm," "peaceful," and "serene" are antonyms that connote a sense of tranquility and harmony, suggesting that things are in their proper place and functioning smoothly. Ultimately, the antonyms for "most messed-up" point to a range of qualities that are distinct from chaos and confusion, and that are often associated with a more positive and productive state of being.