Definition of ruinously adverb from the Oxford Advanced Learner's Dictionary

     

    ruinously

     adverb
    adverb
    BrE BrE//ˈruːɪnəsli//
     
    ; NAmE NAmE//ˈruːɪnəsli//
     
    (formal)
     
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  1. 1in a way that costs a lot of money and more than you can afford ruinously expensive
  2. 2in a way that causes serious problems or damage We are ruinously protective of our children.