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English definition of “arduous”

arduous

adjective uk   /ˈɑː.dju.əs/ us    /ˈɑːr.dʒu-/
difficult, needing a lot of effort and energy: an arduous climb/task/journeyComplicated and difficult to doDifficult to understand
arduously
adverb uk   /-li/ us  
Complicated and difficult to doDifficult to understand
arduousness
noun [U] uk   /-nəs/ us  
Complicated and difficult to doDifficult to understand
(Definition of arduous from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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