Antonyms for middling

average:

atypical, unusual, outstanding, extreme, abnormal.

common:

aristocratic, superior, sophisticated, high, noble, cultured, refined, excellent.

commonplace:

infrequent, rare, uncommon, peculiar.

decent:

indecent, intolerable, unsuitable, insufficient.

few:

many, much.

intermediate:

end.

middling:

exceptional, extraordinary.

noun:

insufficient, inadequate, optimal, unparalleled, matchless, peerless, outstanding, exceptional, individual, sensational, preeminent, wanting, special, strange, rare, unmatched, distinguished, unusual, supreme, optimum, private, unique, first class, peculiar, A1, distinctive, uncommon, maximum, lacking, idiosyncratic.

halfway:

totally, completely, wholly.