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arduous
Arduous is a way of describing something that is extremely tiring and difficult. (adjective)
The John Beargrease Sled Dog Marathon is an example of an arduous race.
Arduous is a sharp, high climb where reaching the top is a challenge. (adjective)
Mt. Everest is an example of an arduous incline.
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See arduous in Webster's New World College Dictionary
See arduous in American Heritage Dictionary 4
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