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arduous adjective
/ˈɑː.dju.əs/
/ˈɑːr.dʒu-/ adj Definition
difficult, needing a lot of effort and energy
an arduous climb/task/journey
arduously adverb
/ˈɑː.dju.ə.sli//ˈɑːr.dʒu-/ adv arduousness noun
/ˈɑː.dju.ə.snəs//ˈɑːr.dʒu-/ n [U] (Definition of arduous adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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