Anything that's unrivaled is the very best of its type. If nobody has ever made a more delicious apple pie than yours, your pie is unrivaled.

Some synonyms for unrivaled are unmatched, incomparable, and peerless. Unrivaled things have no rival, or worthy competitor. When a newspaper's coverage of local events is unrivaled, there is no other paper that provides that kind of news. And if a long jumper's record is unrivaled, it means that not only is she the best, but no other athlete has come close to beating her.

Definitions of unrivaled

adj eminent beyond or above comparison

unrivaled mastery of her art”
matchless, nonpareil, one, one and only, peerless, unmatchable, unmatched, unrivalled
incomparable, uncomparable
such that comparison is impossible; unsuitable for comparison or lacking features that can be compared

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