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Synonyms for Arduous. (2016). Retrieved 2021, June 15, from https://thesaurus.plus/synonyms/arduous
Synonyms for Arduous. N.p., 2016. Web. 15 Jun. 2021. <https://thesaurus.plus/synonyms/arduous>.
Synonyms for Arduous. 2016. Accessed June 15, 2021. https://thesaurus.plus/synonyms/arduous.