Etymology
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unrivalled (adj.)

also unrivaled, 1590s, from un- (1) "not" + past participle of rival (v.).

updated on June 22, 2012

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Definitions of unrivalled from WordNet

unrivalled (adj.)
eminent beyond or above comparison;
Synonyms: matchless / nonpareil / one / one and only / peerless / unmatched / unmatchable / unrivaled
From wordnet.princeton.edu, not affiliated with etymonline.