The Collaborative International Dictionary of English v.0.48:

Unconfuted \Unconfuted\
   See confuted.

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "unconfuted":
   actual, ascertained, attested, authenticated, categorically true,
   certain, certified, confirmed, corroborated, demonstrated,
   determined, documentary, effectual, established, factual,
   historical, not in error, objectively true, proved, real,
   substantiated, sure-enough, true, true as gospel, truthful,
   unanswered, uncontradicted, uncontroverted, undenied, undoubted,
   unerroneous, unfallacious, unfalse, unmistaken, unquestionable,
   unrefutable, unrefuted, validated, veracious, verified,
   veritable