Definitions of ruinous:
  • adjective:   causing injury or blight; especially affecting with sudden violence or plague or ruin
    Example: "A ruinous war"
  • adjective:   extremely harmful; bringing physical or financial ruin
    Example: "A ruinous course of action"

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Search for ruinous at other dictionaries: OneLook, Oxford, American Heritage, Merriam-Webster, Wikipedia

Book See ruinous used in context: 6 Shakespeare works, several books and articles.

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