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Adjective: unequalled  ,ún'ee-kwuld
Usage: Brit, Cdn (US: unequaled)
  1. Radically distinctive and without equal
    "craftsmen whose skill is unequalled"; "he is unequalled in the field of microbiology";
    - alone, unique, unequaled [US], unparalleled, one-of-a-kind

See also: incomparable, uncomparable