ru·in·ous 
/ˈru:wənəs/ adjective
/ˈru:wənəs/ adjective formal 1 : causing or likely to cause damage or destruction
▪ Smoking is ruinous [=(more commonly) dangerous, hazardous] to your health. ▪ ruinous effects/consequences 2 : costing far too much money
▪ ruinous price increases 3 chiefly Brit, formal : falling apart : badly damaged
▪ a ruinous building ▪ The house has fallen into a ruinous state.
▪ Smoking is ruinous [=(more commonly) dangerous, hazardous] to your health. ▪ ruinous effects/consequences
▪ ruinous price increases
▪ a ruinous building ▪ The house has fallen into a ruinous state.
— ru·in·ous·ly adverb
▪ Funding the project would be ruinously expensive.
▪ Funding the project would be ruinously expensive.
