Dandifying is a term that is not often heard in daily conversation. It is defined as making something or someone more elegant or refined, usually in a superficial or excessive way. The antonyms for dandifying are somewhat contradictory, as they all imply a lack of refinement or elegance. The opposite of dandifying could be described as simplifying or casualizing, making something more informal or laid back. Another antonym could be roughening, which would imply making something less polished or smooth. Finally, the opposite of dandifying could be casualizing, which implies making something more relaxed or easygoing.