Antonyms for the phrase "Diagnosis Dual Psychiatry" are quite tricky to find because it is a specific term used in the medical field. However, based on its component words, some possible antonyms can be proposed. For instance, antonyms for "diagnosis" might include uncertainty, confusion, or misdiagnosis. As for "dual," antonyms such as single, individual, or unique could work. Finally, for the word "psychiatry," antonyms might include "non-medical" or "alternative" therapies. Overall, it is important to keep in mind that antonyms often depend on the context and domain of the word, and sometimes, some words may not have easily identifiable opposites.