The Collaborative International Dictionary of English v.0.48:

refute \re*fute"\ (r[-e]*f[=u]t"), v. t. [imp. & p. p.
   Refuted; p. pr. & vb. n. Refuting.] [F. r['e]futer, L.
   refuteare to repel, refute. Cf. Confute, Refuse to deny.]
   To disprove and overthrow by argument, evidence, or
   countervailing proof; to prove to be false or erroneous; to
   confute; as, to refute arguments; to refute testimony; to
   refute opinions or theories; to refute a disputant.
   [1913 Webster]

         There were so many witnesses in these two miracles that
         it is impossible to refute such multitudes. --Addison.
   [1913 Webster]

   Syn: To confute; disprove. See Confute.
        [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "refuting":
   apologetic, confounding, confutative, confuting, contradictory,
   contrary, excusatory, excusing, extenuating, extenuative,
   justificatory, justifying, palliative, refutative, refutatory,
   rehabilitative, vindicative, vindicatory