WordNet (r) 3.0 (2006):

validated
    adj 1: declared or made legally valid; "a validated claim"

Moby Thesaurus II by Grady Ward, 1.0:

67 Moby Thesaurus words for "validated":
   accepted, acknowledged, actual, admitted, affirmed, allowed,
   approved, ascertained, attested, authenticated, avowed, borne out,
   categorically true, certain, certified, circumstantiated, conceded,
   confessed, confirmed, corroborated, countersigned, demonstrated,
   determined, documentary, effectual, endorsed, established, factual,
   fixed, granted, historical, not in error, notarized,
   objectively true, professed, proved, proven, ratified, real,
   received, recognized, sealed, settled, shown, signed, stamped,
   substantiated, sure-enough, sworn and affirmed, sworn to, true,
   true as gospel, truthful, unconfuted, undenied, underwritten,
   undoubted, unerroneous, unfallacious, unfalse, unmistaken,
   unquestionable, unrefuted, veracious, verified, veritable,
   warranted