Synonyms and related words :
baneful, brutal, calamitous, cataclysmal, cataclysmic, catastrophic, consuming, consumptive, deadly, death-bringing, deathful, deathly, demolishing, demolitionary, depredatory, desolating, destroying, destructive, devastating, disastrous, doomful, fatal, fateful, feral, fratricidal, killing, lethal, malign, malignant, mortal, nihilist, nihilistic, pernicious, ravaging, ruining, ruinous, savage, self-destructive, subversionary, subversive, suicidal, vandalic, vandalish, vandalistic, virulent, wasteful, wasting, withering