Adjective has 1 sense

• unrivalled(s = adj.all) matchless, nonpareil, one, one and only, peerless, unmatchable, unmatched, unrivaled - eminent beyond or above comparison; "a peerless scholar"; "infamy unmatched in the Western world"; "matchless beauty"; "she's one girl in a million"; "the one and only Muhammad Ali"; "the team's nonpareil center fielder"; "unrivaled mastery of her art"; "wrote with unmatchable clarity"