American English

Definition of arduous adjective from the Oxford Advanced American Dictionary

 

arduous

 adjective
adjective
NAmE//ˈɑrdʒuəs//
 
 
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involving a lot of effort and energy, especially over a period of time an arduous journey across the Andes The work was arduous.
arduously adverb
 
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They searched arduously for clues.
See the Oxford Advanced Learner's Dictionary entry: arduous