agreeable, all right, alright, copacetic(also copasetic or copesetic), ducky, fine, good, hunky-dory, jake(slang), OK(or okay), palatable

delectable, delicious, delightful, dreamy, felicitous, gratifying, nice, pleasant, pleasing, scrumptious, welcomeacceptable, adequate, decent, passable, tolerable

disagreeable, unsatisfactory

bad, deficient, inferior, lousy, poor, punk, substandard, unacceptable, wanting, wretchedmediocre, middling, second-class, second-rate

acceptable, adequate, all right, decent, fairish, fine, good, OK(or okay), passable, respectable, serviceable, tolerable

agreeable, bearable, endurable, sufferableaverage, fair, indifferent, mediocre, middling, minimalcommon, ordinary, run-of-the-mill, run-of-the-mine(or run-of-mine), second-rate, so-sostandard, unexceptionalappropriate, correct, due, fitting, meet, proper, right, seemly, suitable, useful, worthygratifying, satisfying

up to snuff

deficient, inadequate, insufficient, lacking, unacceptable, unsatisfactory, wanting

disagreeable, disreputable, improper, indecent, objectionable, unfit, unsuitable, unworthy, useless, wrongbad, cheap, defective, faulty, imperfect, incomplete, lamentable, pitiful, shoddydissatisfyinginsufficient, meager(or meagre), mean, miserly, niggardly, poor, scanty, shabby, short, skimpy, spare, stingyinsufferable, intolerable, unbearable, unendurableatrocious, execrable, miserable, vile, wretchedexceptional, exquisite, extreme, fancy, first-class, high-grade, matchless, maximized, maximum, optimal, optimum, peerless, preeminent, premium, special, supreme, unmatched, unparalleledA1, 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