The phrase "most described" refers to something that has been extensively explained or detailed. Antonyms for this phrase could be "least described", "vaguely mentioned", "barely touched upon", "unexplained", "undescribed", or "unclear". These words convey the opposite meaning of "most described" and suggest that the subject in question lacks the level of detail or explanation that one might expect. In certain contexts, such as academic writing or reporting, it is important to provide a comprehensive understanding of a topic or issue. Therefore, using antonyms for "most described" can indicate that further research or explanation is necessary.