When it comes to the opposite of "un stylish," there are quite a few options. Some antonyms include fashionable, chic, refined, trendy, elegant, sophisticated, sleek, polished, and suave. These words denote a sense of class, taste, and overall good style, which is the polar opposite of being labeled as un stylish. By using any of these antonyms to describe someone or something, you are essentially stating that they possess an innate sense of fashion that sets them apart from the rest. Whether referring to clothing, decor, or personal style, it's safe to say that being un stylish is the last thing anyone wants to be.