OK

bad, deficient, inferior, lousy, poor, punk, substandard, unacceptable, wanting, wretched

mediocre, middling, second-class, second-rate

disagreeable, disreputable, improper, indecent, objectionable, unfit, unsuitable, unworthy, useless, wrong

bad, cheap, defective, faulty, imperfect, incomplete, lamentable, pitiful, shoddy

dissatisfying

insufficient, meager (or meagre), mean, miserly, niggardly, poor, scanty, shabby, short, skimpy, spare, stingy

insufferable, intolerable, unbearable, unendurable

atrocious, execrable, miserable, vile, wretched

exceptional, exquisite, extreme, fancy, first-class, high-grade, matchless, maximized, maximum, optimal, optimum, peerless, preeminent, premium, special, supreme, unmatched, unparalleled

A1, bang-up, banner, boss [slang], capital, classic, crackerjack, dandy, divine, fabulous, first-rate, grand, great, groovy, heavenly, jim-dandy, keen, marvelous (or marvellous), mean, neat, nifty, noble, par excellence, prime, sensational, splendid, stellar, sterling, superb, superior, superlative, supernal, swell, terrific, tip-top, top, top-notch, unsurpassed, wonderful

unbearably

inappropriately, incorrectly, indecently, unsuitably

awfully, deplorably, disastrously, dreadfully, horrendously, horribly, horridly, miserably, terribly

ban, enjoin, forbid, illegalize, interdict, prohibit, proscribe

disregard, ignore, neglect, overlook

rebuff, rebut, refuse, spurn

blacklist, censure, condemn, criticize, damn, denounce, deprecate, depreciate, disparage, reprehend, reprobate

dislike, mind

detest, hate, loathe

dissent (from), object (to), oppose