Usually means: Burdensome, difficult, and demanding task.
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We found 30 dictionaries that define the word onerous:

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

Business (4 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. Glossary of Legal Terms (No longer online)
  3. onerous: Legal dictionary
  4. 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,     midnight blue,     burgundy,     olive green, more...



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