(a.) of a pertaining to a catastrophe.

baneful black calamitous cataclysmal cataclysmic consuming consumptive deadly demolishing demolitionary depredatory desolating destroying destructive devastating dire disastrous doomful fatal fateful fratricidal grievous insurrectionary internecine nihilist nihilistic radical ravaging revolutional revolutionary revulsionary revulsive ruining ruinous self-destructive subversionary subversive suicidal sweeping tragic transilient vandalic vandalish vandalistic wasteful wasting withering wreckful