Meaning : Eminent beyond or above comparison.
Example :
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.
Synonyms : matchless, nonpareil, one, one and only, unmatchable, unmatched, unrivaled, unrivalled