So-so

Antonyms of so-so:
intolerably, unacceptably, extraordinary, a1, capital, choice, classic, distinguished, excellent, exceptional, exquisite, fabulous, fantastic, fine, first-class, first-rate, grand, great, marvelous, matchless, maximum, nifty, number one, optimal, optimum, outstanding, par excellence, peerless, preeminent, prime, sensational, special, splendid, stellar, sterling, superb, superior, superlative, supreme, swell, terrific, tip-top, top, top-notch, unmatched, unparalleled, unsurpassed, deficient, inadequate, insufficient, lacking, unacceptable, unsatisfactory, wanting.