Synonyms to back-number

banal, asinine, average, bewhiskered, bland, bromidic, central, cliched, common, commonplace, corny, cut-and-dried, everyday, fade, familiar, fatuous, flat, fusty, hackney, hackneyed, hoary, humdrum, intermediary, intermediate, jejune, mean, medial, median, mediocre, medium, middle-of-the-road, middling, milk-and-water, moderate, moth-eaten, musty, namby-pamby, normal, old, old hat, ordinary, pedestrian, petty, platitudinous, routine, sapless, set, silly, simple, square, stale, standard, stereotyped, stock, threadbare, timeworn, tired, trite, trivial, truistic, unimaginative, unoriginal, usual, vapid, warmed-over, waterish, watery, well-known, well-worn, wishy-washy, worn, worn thin, bearded, stubbled, stubbly, unshaven, whiskered, Astroturf, Attic, Babbittish, Mickey Mouse, Philistine, Spart