The Collaborative International Dictionary of English v.0.48:

Unmatched \Unmatched\
   See matched.

WordNet (r) 3.0 (2006):

unmatched
    adj 1: of the remaining member of a pair, of socks e.g. [syn:
           odd, unmatched, unmated, unpaired]
    2: 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, unrivaled,
       unrivalled]

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "unmatched":
   best, beyond compare, beyond comparison, champion, choice,
   contrasting, counter, different, disparate, dissimilar, divergent,
   diverse, easily first, elect, elite, facile princeps, for the best,
   greatest, handpicked, hardly like, immortal, incomparable,
   inimitable, invincible, matchless, nonuniform, nulli secundus, odd,
   off, offbeat, only, optimal, optimum, out, paramount, peerless,
   picked, prime, prize, quintessential, scarcely like,
   second to none, select, sui generis, supreme, surpassing, unalike,
   unapproachable, unapproached, unbeatable, unequaled, unexampled,
   unexcelled, unidentical, unique, unlike, unmatchable, unpaired,
   unparagoned, unparalleled, unpeered, unresembling, unrivaled,
   unsame, unsimilar, unsurpassable, unsurpassed, very best,
   without equal, without parallel