acceptable, adequate, all right, decent, fine, good, OK(or okay), passable, respectable, satisfactory, 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