ruinous

adjectives

extremely harmful; bringing physical or financial ruin
"a catastrophic depression"; "catastrophic illness"; "a ruinous course of action"
catastrophic, ruinous
is derived from
ruin
is derived from
ruin
causing injury or blight; especially affecting with sudden violence or plague or ruin
"the blasting effects of the intense cold on the budding fruit"; "the blasting force of the wind blowing sharp needles of sleet in our faces"; "a ruinous war"
blasting, ruinous