Uncool is an adjective which describes something that is not fashionable or trendy. Antonyms for "un-cool" or "unfashionable" include cool, hip, trendy, fashionable, stylish or chic. These words describe things which are popular or in vogue, and often associated with youth culture or the latest trends in fashion, music or technology. Cool, for instance, suggests a sense of ease or detachment, while hip implies being knowledgeable or being in the know. Fashionable and stylish refer to the latest styles and trends, while chic suggests a sense of elegance and sophistication. Choosing the right antonym for "un-cool" depends largely on the context and the desired tone.