Catastrophic

a.

1.

Of a pertaining to a catastrophe.

Adj.

1.

catastrophic - extremely harmful; bringing physical or financial ruin; "a catastrophic depression"; "catastrophic illness"; "a ruinous course of action" Synonyms: ruinous

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