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Adjective: unrivalled  ,ún'rI-vuld
Usage: Brit, Cdn (US: unrivaled)
  1. Eminent beyond or above comparison
    "unrivalled mastery of her art";
    - matchless, nonpareil, one, one and only, peerless, unmatched, unmatchable, unrivaled [US]

See also: incomparable, uncomparable