The Collaborative International Dictionary of English v.0.48:

Antiquated \An"ti*qua`ted\, a.
   Grown old. Hence: Bygone; obsolete; out of use;
   old-fashioned; as, an antiquated law. "Antiquated words."
   --Dryden.
   [1913 Webster]

         Old Janet, for so he understood his antiquated
         attendant was denominated.               --Sir W.
                                                  Scott.
   [1913 Webster]

   Syn: Ancient; old; antique; obsolete. See Ancient.
        [1913 Webster]

WordNet (r) 3.0 (2006):

antiquated
    adj 1: so extremely old as seeming to belong to an earlier
           period; "a ramshackle antediluvian tenement";
           "antediluvian ideas"; "archaic laws" [syn:
           antediluvian, antiquated, archaic]

Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "antiquated":
   Gothic, Victorian, abandoned, abjured, ago, ancient, antediluvian,
   antique, archaic, blown over, by, bygone, bypast, classical, dated,
   dead, dead and buried, deceased, defunct, departed, deserted,
   discontinued, disused, done with, elapsed, expired, extinct,
   finished, forgotten, fossil, fossilized, fusty, gone,
   gone glimmering, gone-by, grown old, has-been, irrecoverable,
   lapsed, medieval, mid-Victorian, moldy, no more, not worth saving,
   obsolescent, obsolete, of other times, old, old hat, old-fashioned,
   old-timey, old-world, oldfangled, on the shelf, out, out of date,
   out of use, out-of-date, outdated, outmoded, outworn, over, passe,
   passed, passed away, past, past use, pensioned off, petrified,
   primitive, quaint, relinquished, renounced, resigned, retired,
   run out, superannuate, superannuated, superseded, vanished,
   worn-out, wound up