The term "mis-managed" refers to something that is not correctly or poorly managed. The antonyms for this word are "well-managed," "properly managed," or "efficiently managed." If something is well-managed, it means that it is being done in an effective and efficient way, with clear objectives and proper supervision. Properly managed means that a situation or task is being conducted with due diligence, caution, and prudence. On the other hand, efficiently managed means that a task is being done in a way that maximizes resources and time, ensuring the desired outcome is achieved with minimum input. In short, the antonyms of "mis-managed" are synonymous with excellence, success, and good management practices.