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Adjective ruinous has 2 senses
catastrophic, ruinous - extremely harmful; bringing physical or financial ruin; "a catastrophic depression"; "catastrophic illness"; "a ruinous course of action"Antonym:  harmless (indirect, via harmful)
 
blasting, ruinous - 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"Antonym:  constructive (indirect, via destructive)
 
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