69 entries under demanding topic. ×

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scabrous(adjective, difficult, awkward, grueling)
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slavish(adjective, difficult, awkward, grueling)
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sticky(adjective, difficult, awkward, tricky)
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terrible(adjective, tough, difficult, awkward)
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toilful(adjective, difficult, awkward, grueling)
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tricky(adjective, difficult, awkward, strenuous)
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uncharitable(adjective, exacting)
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unforgiving
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uphill battle(expression, adjective, difficult, awkward)
10 years ago|11k views|share |citing 
APASmart Define. (2016). challenging thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/challenging/thesaurus/synonyms
ChicagoSmart Define. 2016. "challenging thesaurus" https://smartdefine.org/challenging/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, challenging thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/challenging/thesaurus/synonyms>.
MLASmart Define. "challenging thesaurus" 2 March 2016. Web. 25 September 2026. <https://smartdefine.org/challenging/thesaurus/synonyms>