54 entries under difficult topic. ×

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challenging(adjective, awkward, thorough, demanding)
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exhausting(adjective, tough, rough, heavy)
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formidable(adjective, tough, rough, heavy)
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grueling(adjective, awkward, demanding, problematical)
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herculean(adjective, tough, rough, heavy)
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intricate(adjective, tough, rough, heavy)
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labored(adjective, tough, rough, heavy)
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operose(adjective, tough, rough, heavy)
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problematical(adjective, awkward, demanding, grueling)
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testing(adjective, awkward, thorough, demanding)
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tricky(adjective, awkward, demanding, grueling)
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troublesome(adjective, tough, rough, heavy)
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uphill(adjective, tough, rough, heavy)
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wearisome(adjective, tough, rough, heavy)
<123>
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APASmart Define. (2016). unsparing thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unsparing/thesaurus/synonyms
ChicagoSmart Define. 2016. "unsparing thesaurus" https://smartdefine.org/unsparing/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, unsparing thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unsparing/thesaurus/synonyms>.
MLASmart Define. "unsparing thesaurus" 24 March 2016. Web. 25 September 2026. <https://smartdefine.org/unsparing/thesaurus/synonyms>