The term "bon ton" refers to a style of sophisticated and fashionable behaviour. Its antonyms include words that describe a lack of refinement or taste. Examples of antonyms for "bon ton" might include "crass," "vulgar," or "gauche." These words suggest an absence of culture, manners, or good taste. Other possible antonyms for "bon ton" might include "uncultured," "rough," "rude," or "tacky." While "bon ton" implies elegance and social grace, its antonyms suggest a lack of refinement or polish. Regardless of the context or the specific word choice, these antonyms are all intended to convey the opposite of "bon ton.