ruinous

(s) extremely harmful; bringing physical or financial ruin
- a catastrophic depression
- catastrophic illness
- a ruinous course of action
catastrophic,
(s) 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,

catastrophic blasting

ruinously