un·ri·valed /ˌʌnˈraɪvəld/
  (a.)無敵的
  Un·ri·valed a. Having no rival; without a competitor; peerless. [Spelt also unrivalled.]
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  unrivaled
       adj : eminent beyond or above comparison; "matchless beauty"; "the
             team's nonpareil center fielder"; "she's one girl in a
             million"; "the one and only Muhammad Ali"; "a peerless
             scholar"; "infamy unmatched in the Western world";
             "wrote with unmatchable clarity"; "unrivaled mastery of
             her art" [syn: matchless, nonpareil, one(a), one
             and only(a), peerless, unmatched, unmatchable, unrivalled]