Usually means: Causing or resulting in destruction.
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We found 26 dictionaries that define the word ruinous:

General (23 matching dictionaries)
  1. ruinous: Merriam-Webster.com
  2. ruinous: Oxford Learner's Dictionaries
  3. ruinous: American Heritage Dictionary of the English Language
  4. ruinous: Collins English Dictionary
  5. ruinous: Vocabulary.com
  6. Ruinous, ruinous: Wordnik
  7. ruinous: Cambridge Advanced Learner's Dictionary
  8. ruinous: Wiktionary
  9. ruinous: Webster's New World College Dictionary, 4th Ed.
  10. ruinous: The Wordsmyth English Dictionary-Thesaurus
  11. ruinous: Infoplease Dictionary
  12. Ruinous, ruinous: Dictionary.com
  13. ruinous: Cambridge Essential American English Dictionary
  14. Ruinous: Online Plain Text English Dictionary
  15. ruinous: Webster's Revised Unabridged, 1913 Edition
  16. ruinous: Rhymezone
  17. Ruinous: AllWords.com Multi-Lingual Dictionary
  18. ruinous: Webster's 1828 Dictionary
  19. ruinous: Free Dictionary
  20. ruinous: Mnemonic Dictionary
  21. ruinous: Dictionary/thesaurus

Business (1 matching dictionary)
  1. ruinous: Legal dictionary

Computing (1 matching dictionary)
  1. ruinous: Encyclopedia

Slang (1 matching dictionary)
  1. ruinous: Urban Dictionary

(Note: See ruinously as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Causing ruin; destructive, calamitous
adjective:  Extremely costly; so expensive as to cause financial ruin.
adjective:  Characterized by ruin; ruined; dilapidated; as, an edifice, bridge, or wall in a ruinous state.

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