Unfashionable is defined as being out of style, outdated, or old-fashioned. For those seeking alternative terms, here are some synonyms to consider.
Antiquated, archaic, passe, dowdy, frumpy, old-school, outmoded, outdated, retro, unstylish, old-timey, behind the times, and unfashionably old-fashioned. While each term carries a slightly different connotation, they all generally refer to something that is no longer considered in vogue. By using these synonyms, one can more creatively express an idea in their writing or speech while avoiding the use of the overused word unfashionable.