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arduous

ar·du·ous [ rjoo əss ]


adjective 
Definition:
 
1. difficult and tiring: requiring hard work or continuous physical effort

2. steep or demanding: very difficult to traverse, endure, or overcome

[Mid-16th century. < Latin arduus "steep, difficult"]

ar·du·ous·ly adverb
ar·du·ous·ness noun

Word Key: Synonyms

See hard.

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