injurious, detrimental, hurtful, noxious, evil, mischievous, ruinous, malefic, demolitionary, internecine, adverse, inimical, harassing, sinister, subversive, incendiary, virulent, calamitous, cataclysmic, corroding, toxic, baleful, nocuous, consumptive, painful, wounding, crippling, bad, malicious, malignant, sinful, pernicious, baneful, unwholesome, pestilential, pestiferous, deleterious, annihilative, corrupting, menacing, ill-omened, dire, morbific, devouring, prejudicial, damaging, corrupt, vicious, insidious, treacherous, devastating, catastrophic, disastrous, wild, murderous, undetermining, sapping, destructive, unhealthy, stunting, habit-forming, killing, fatal, mortal, serious, costly, fraught with harm, doing harm, fraught with evil, painful, sore, extirpative, afflicting, distressing, fell, diabolic, brutal, unhealthful, satanic, demoniac, ill, grievous, mortal, lethal, malevolent, mephitic, venomous, cruel, unfortunate, disadvantageous, felonious, aching, pricking, objectionable, fiendish, maleficent, unpropitious, unlucky, malign, sinistrous, noisome, devilish, corrosive; see also dangerous 1, 2. deadly, ominous, poisonous, wicked.
Antonyms pure, healthful*, good.