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Definitions of arduous
  1. adjective
    taxing to the utmost; testing powers of endurance
    "your willingness after these six arduous days to remain here"
  2. adjective
    characterized by effort to the point of exhaustion; especially physical effort
    "worked their arduous way up the mining valley"
  3. adjective
    difficult to accomplish; demanding considerable mental effort and skill
    "the arduous work of preparing a dictionary"

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