WordWeb Online

1. Not in accord with or not following current fashion
   "melodrama of a now unfashionable kind"; "unfashionable clothes";
   - unstylish, daggy [Austral, NZ, informal]
    
2. Unpopular and considered unappealing or unfashionable at the time
   - out of fashion, daggy [Austral, NZ, informal]

See also: antique, dated, démodé, dowdy, ex, fogeyish, fogyish, frumpish, frumpy, moss-grown, mossy, old, old-fashioned, old-hat [informal], out, outmoded, passé, passée, prehistoric, rinky-dink [N. Amer, informal], stick-in-the-mud, stodgy, unpopular, vieux jeu

Antonym: fashionable