ruinous /ˈruːwənəs/ adjective Learner's definition of RUINOUS
formal
1
: causing or likely to cause damage or destruction破坏性的;毁灭性的 -
Smoking is ruinous [=(more commonly) dangerous, hazardous] to your health.吸烟对健康的危害极大。
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ruinous effects/consequences灾难性的影响/后果
2
: costing far too much money耗资巨大的;极其昂贵的 3
chiefly British, formal : falling apart : badly damaged严重受损的;毁坏了的