The antonyms for the word "mis-handled" are "handled," "managed," "dealt with," or "fixed." When something is properly handled, it means it is well-organized, taken care of, and managed in a professional and efficient manner. Conversely, mis-handled implies that something has been poorly managed, dealt with incorrectly, or mishandled. It could denote a lack of care, attention, or competence when dealing with something. Therefore, it is crucial to handle every situation with vigilance, expertise, and care to avoid unnecessary trouble and prevent potential negative outcomes.