Antifashionable, as the word suggests, is something that goes against fashion trends. Some of the synonyms of antifashionable are unfashionable, retro, vintage, outdated, and old-fashioned. Whereas, others include nonconformist, unconventional, avant-garde, radical, and rebellious. These words describe a style that isn't bound by fashion norms and tends to stand out. It's often associated with a trendy or hipster crowd that seeks to create unique looks that challenge the mainstream fashion industry. Whatever term is used, the focus is on being genuine and refusing to conform to what society perceives as fashionable. Such a mindset promotes individual expression and creativity.