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Synonyms for Unrivalled (same or very similar meaning)

WordNet sense 1 (eminent beyond or above comparison):
matchless, nonpareil, one, peerless, unmatched, unrivaled, unmatchable

WordNet sense 2 (such that comparison is impossible; unsuitable for comparison or lacking features that can be compared):
incomparable, uncomparable

From the ODE community, based on WordNetadd/edit