To present participles which come from intransitive verbs, or are themselves employed as adjectives, to mark the absence of the activity, disposition, or condition implied by the participle;

State of an open buy/sell order that is yet to find an opposite sell/buy order to create a trade. (Opposite to matched)

of the remaining member of a pair, of socks e.g.

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"

Almost as good as the competition.

"ineguagliato, senza pari"