Oxford Dictionary
unrivalled
unrivalled |ʌnˈrʌɪv (ə )ld |(US unrivaled ) ▶adjective better than everyone or everything of the same type: the paper's coverage of foreign news is unrivalled.
Oxford Thesaurus
unrivalled
unrivalled adjective an unrivalled collection of rare coins: unequalled, without equal, unparalleled, without parallel, matchless, unmatched, peerless, without peer, unsurpassed, unbeaten, unexcelled, incomparable, beyond compare, inimitable; superlative, extraordinary, supreme, top, paramount, outstanding, singular, unique, rare, perfect, second to none, in a class of its own, consummate, record, best ever, nonpareil; French par excellence. ANTONYMS average.