Most old-school is synonymous with traditional, vintage, classic or conventional. Therefore, the antonyms for old-school would be modern, contemporary, innovative, unconventional or avant-garde. The word old-school can be used to describe someone or something that is old-fashioned, outdated, or adhering to old-fashioned ideas or practices. In contrast, modern refers to the latest trends and innovative ideas. The opposing words of old-fashioned or old-school would be contemporary or avant-garde, which are terms used to describe something that is current, novel, and cutting-edge. So, while old-school may be beloved by some, the antonyms offer a new, fresh and exciting perspective.