1. matchless, nonpareil, one(prenominal), one and only(prenominal), peerless, unmatched, unmatchable, unrivaled, unrivalled, incomparable (vs. comparable), uncomparable
usage: 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"