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We found 32 dictionaries with English definitions that include the word arduous:
Click on the first link on a line below to go directly to a page where "arduous" is defined.

General (29 matching dictionaries)

1. arduous: Merriam-Webster.com [home, info]
2. arduous: Oxford Dictionaries [home, info]
3. arduous: American Heritage Dictionary of the English Language [home, info]
4. arduous: Collins English Dictionary [home, info]
5. arduous: Vocabulary.com [home, info]
6. arduous: Macmillan Dictionary [home, info]
7. Arduous, arduous: Wordnik [home, info]
8. arduous: Cambridge Advanced Learner's Dictionary [home, info]
9. arduous: Wiktionary [home, info]
10. arduous: Webster's New World College Dictionary, 4th Ed. [home, info]
11. arduous: V2 Vocabulary Building Dictionary [home, info]
12. arduous: The Wordsmyth English Dictionary-Thesaurus [home, info]
13. arduous: Infoplease Dictionary [home, info]
14. Arduous, arduous: Dictionary.com [home, info]
15. arduous: Online Etymology Dictionary [home, info]
16. arduous: UltraLingua English Dictionary [home, info]
17. arduous: Cambridge Dictionary of American English [home, info]
18. Arduous: Online Plain Text English Dictionary [home, info]
19. arduous: Webster's Revised Unabridged, 1913 Edition [home, info]
20. arduous: Rhymezone [home, info]
21. arduous: AllWords.com Multi-Lingual Dictionary [home, info]
22. arduous: Webster's 1828 Dictionary [home, info]
23. arduous: Free Dictionary [home, info]
24. arduous: Mnemonic Dictionary [home, info]
25. arduous: WordNet 1.7 Vocabulary Helper [home, info]
26. arduous: LookWAYup Translating Dictionary/Thesaurus [home, info]
27. arduous: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

28. arduous: Legal dictionary [home, info]

Computing (1 matching dictionary)

29. arduous: Encyclopedia [home, info]

Slang (1 matching dictionary)

30. arduous: Urban Dictionary [home, info]

(Note: See arduousness for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (arduous) ▸ adjective:  difficult to accomplish; demanding considerable mental effort and skill ("The arduous work of preparing a dictionary") ▸ adjective:  characterized by toilsome effort to the point of exhaustion; especially physical effort ("Worked their arduous way up the mining valley") ▸ adjective:  taxing to the utmost; testing powers of endurance ("Your willingness after these six arduous days to remain here- F.D.Roosevelt") ▸ Also see arduousness ▸ Word origin ▸ Words similar to arduous ▸ Usage examples for arduous ▸ Popular nouns described by arduous ▸ Words that often appear near arduous ▸ Rhymes of arduous ▸ Invented words related to arduous