Usually means: Burdensome, difficult, and demanding task.
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We found 31 dictionaries that define the word onerous:

General (25 matching dictionaries)
  1. onerous: Longman Dictionary of Contemporary English
  2. onerous: Merriam-Webster
  3. onerous: Oxford Learner's Dictionaries
  4. onerous: American Heritage Dictionary of the English Language
  5. onerous: Collins English Dictionary
  6. onerous: Vocabulary.com
  7. Onerous, onerous: Wordnik
  8. onerous: Cambridge Advanced Learner's Dictionary
  9. onerous: Wiktionary
  10. onerous: Webster's New World College Dictionary, 4th Ed.
  11. onerous: The Wordsmyth English Dictionary-Thesaurus
  12. onerous: Infoplease Dictionary
  13. onerous: Dictionary.com
  14. onerous: Online Etymology Dictionary
  15. onerous: Cambridge Essential American English Dictionary
  16. Onerous: Online Plain Text English Dictionary
  17. onerous: Webster's Revised Unabridged, 1913 Edition
  18. onerous: Rhymezone
  19. onerous: AllWords.com Multi-Lingual Dictionary
  20. onerous: Webster's 1828 Dictionary
  21. onerous: FreeDictionary.org
  22. onerous: Mnemonic Dictionary
  23. onerous: TheFreeDictionary.com

Business (5 matching dictionaries)
  1. onerous: Merriam-Webster Legal Dictionary
  2. MoneyGlossary.com (No longer online)
  3. Glossary of Legal Terms (No longer online)
  4. onerous: Legal dictionary
  5. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)
  1. onerous: Encyclopedia

(Note: See onerously as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Imposing or constituting a physical, mental, or figurative load which can be borne only with effort; burdensome.

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Colors:
    dark gray,     charcoal,     deep brown,     midnight blue,     burgundy, more...



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