ruinous

extremely harmful; bringing physical or financial ruin

• “a catastrophic depression”
• “catastrophic illness”
• “a ruinous course of action”

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”