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Definition of ruinous adjective from the Oxford Advanced Learner's Dictionary

ruinous

adjective
 
/ˈruːɪnəs/
 
/ˈruːɪnəs/
(formal)
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  1. costing a lot of money and more than you can afford
    • ruinous legal fees
    • They were forced to sell out at a ruinous loss.
  2. causing serious problems or damage synonym devastating
    • The decision was to prove ruinous.
    • Such action would be ruinous to her career.
    • a ruinous mistake
  3. (of a town, building, etc.) destroyed or severely damaged
    • The buildings were in a ruinous state.
    • This part of the church is ruinous.
  4. Word Originlate Middle English (also in the sense ‘falling down’): from Latin ruinosus, from ruina, from ruere ‘to fall’.
See ruinous in the Oxford Advanced American Dictionary
hat-trick
noun
 
 
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