The phrase "over refined" is often used to describe something that is too sophisticated or polished. Antonyms for this term would include words that convey the opposite meaning, such as "unrefined," "raw," "rough," "rustic," and "earthy." These words suggest a lack of refinement or polish, and instead imply a more natural or unpolished state. Other antonyms for "over refined" might include expressions like "unadorned," "simple," "plain," and "basic." Depending on the context, these words might be used to indicate a desire for simplicity or a preference for things that are more natural or unpretentious.