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src: wikipedia
- Definition
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- arduous :characterized by effort to the point of exhaustion; especially physical effort
- worked their arduous way up the mining valley|a grueling campaign|hard labor|heavy work|heavy going|spent many laborious hours on the project|set a punishing pace
- arduous :taxing to the utmost; testing powers of endurance
- his final, straining burst of speed|a strenuous task|your willingness after these six arduous days to remain here
- arduous :difficult to accomplish; demanding considerable mental effort and skill
- the arduous work of preparing a dictionary