Synonyms and related words :
baleful, baneful, brutal, corroding, corrosive, corrupting, corruptive, counterproductive, damaging, deadly, death-bringing, deathful, deathly, deleterious, destructive, detrimental, disadvantageous, disserviceable, distressing, fatal, feral, harmful, hurtful, injurious, internecine, killing, malefic, malevolent, malign, malignant, mischievous, mortal, noisome, noxious, ominous, pernicious, pestilent, pestilential, poisonous, prejudicial, savage, scatheful, toxic, venenate, veneniferous, venenous, venomous, vicious, virulent