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adjectivetaxing to the utmost; testing powers of endurance
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adjectivecharacterized by effort to the point of exhaustion; especially physical effort
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adjectivedifficult to accomplish; demanding considerable mental effort and skill
Examples of arduous
- "your willingness after these six arduous days to remain here"
- "worked their arduous way up the mining valley"
- "the arduous work of preparing a dictionary"