The Collaborative International Dictionary of English v.0.48:

Anachronistic \An*ach`ro*nis"tic\, a.
   Erroneous in date; containing an anachronism. --T. Warton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

anachronistic
    adj 1: chronologically misplaced; "English public schools are
           anachronistic" [syn: anachronic, anachronous,
           anachronistic]

Moby Thesaurus II by Grady Ward, 1.0:

22 Moby Thesaurus words for "anachronistic":
   ahead of time, antedated, beforehand, behind time, behindhand,
   dated, early, foredated, late, metachronistic, misdated, mistimed,
   out of date, out of season, overdue, parachronistic, past due,
   postdated, prochronistic, tardy, unpunctual, unseasonable