112 entries under adjective topic. ×

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merciless
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nerve-racking
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obdurate
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punitive
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relentless
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ruthless
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sapping(difficult, demanding, strenuous, trying)
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stony-hearted
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uncharitable(demanding, exacting)
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unfeeling
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unforgiving(severe, violent, demanding, exacting)
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unsympathetic
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APASmart Define. (2015). taxing thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/taxing/thesaurus/synonyms
ChicagoSmart Define. 2015. "taxing thesaurus" https://smartdefine.org/taxing/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, taxing thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/taxing/thesaurus/synonyms>.
MLASmart Define. "taxing thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/taxing/thesaurus/synonyms>