Thesaurus

abominable, abusive, acerb, acerbic, aching, achy, acid, acrid, afflictive, agonised, agonising, agonized, agonizing, atrocious, awful, bad, barbarous, beastly, bestial, biting, bitter, blistering, bruising, brutal, brute, brutish, burning, calumniatory, calumnious, cannibalic, catastrophic, caustic, chafed, cold, cold-blooded, comfortless, corked, corky, counterproductive, crappy, cruel, damaging, defamatory, deleterious, denigrating, denigrative, denigratory, deplorable, destructive, detrimental, disadvantageous, disobedient, displeasing, distressing, dour, dreadful, embarrassing, evil, excruciating, fearful, fell, forbidding, frightful, galled, god-awful, grim, hard, harmful, harrowing, harsh, hellish, hopeless, horrid, hot, hurtful, icky, ill, ill-natured, incompetent, inhuman, inhumane, injurious, insensate, insidious, irritating, itchy, lamentable, libellous, libelous, lousy, malign, mediocre, mischievous, miserable, mortifying, nasty, naughty, negative, no-good, nocent, noxious, offensive, painful, pernicious, pitiful, pitiless, poignant, poor, prejudicial, prejudicious, pretty, prickling, racking, raw, rebarbative, repellant, repellent, rotten, rough, roughshod, rubber, ruinous, sad, saddle-sore, savage, sensitive, severe, sharp, sharp-worded, slanderous, sore, sorry, stabbing, stinging, stinking, stinky, subtle, sulfurous, sulphurous, swingeing, tart, tender, terrible, tingling, torturesome, torturing, torturous, tough, toxic, traumatic, uncomfortable, uncool, uneasy, unfavorable, unfavourable, ungrateful, unhappy, unkind, unpalatable, unpleasant, unskilled, unspeakable, unsuitable, unwholesome, venomous, vicious, virulent, vitriolic, warm, worse, worst, wounding, wrenching, wretched

painful is a ADJ.