unmatchable

1. eminent beyond or above comparison

    e.g. 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

    Synonym: matchless nonpareil one(a) one and only(a) peerless unmatched unrivaled unrivalled