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Definition of Ruinous
1. Adjective. Extremely harmful; bringing physical or financial ruin. "A ruinous course of action"
2. Adjective. Causing injury or blight; especially affecting with sudden violence or plague or ruin. "A ruinous war"
Definition of Ruinous
1. a. Causing, or tending to cause, ruin; destructive; baneful; pernicious; as, a ruinous project.
Definition of Ruinous
1. destructive [adj] - See also: destructive