UNRIVALED
matchless, nonpareil, one, one and only, peerless, unmatched, unmatchable, unrivaled, unrivalled
(adjective) eminent beyond or above comparison; “matchless beauty”; “the team’s nonpareil center fielder”; “she’s one girl in a million”; “the one and only Muhammad Ali”; “a peerless scholar”; “infamy unmatched in the Western world”; “wrote with unmatchable clarity”; “unrivaled mastery of her art”
Source: WordNet® 3.1
Etymology
Adjective
unrivaled (not comparable)
(American spelling) beyond compare, far surpassing any other, unparalleled, without rival.
Source: Wiktionary
Un*ri"valed, a.
Definition: Having no rival; without a competitor; peerless. [Spelt also
unrivalled.] Pope.
Source: Webster’s Unabridged Dictionary 1913 Edition