ruinous
— Adjective
– English
～ 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"
ruinous
— Adjective
– English
～ extremely harmful; bringing physical or financial ruin; "a catastrophic depression"; "catastrophic illness"; "a ruinous course of action"
ruinously
— Adverb
– English
～ in a ruinous manner or to a ruinous degree; "ruinously high wages"