4 entries under strenuously topic. ×

8
painfully(adverb, badly, severely, vigorously, painfully)
5
heavily(adverb, easy, laboriously)
4
difficultly(adverb, hard, easy, difficultly, laboriously)
0
tiringly(adverb, heavily, laboriously)
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APASmart Define. (2015). arduously thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/arduously/thesaurus/synonyms
ChicagoSmart Define. 2015. "arduously thesaurus" https://smartdefine.org/arduously/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, arduously thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/arduously/thesaurus/synonyms>.
MLASmart Define. "arduously thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/arduously/thesaurus/synonyms>