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unflinching(adjective, mean, severe, harsh, cruel)
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unremitting(adjective, hard, tough, harsh, cruel)
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unstoppable(adjective, harsh, cruel, determined, fierce)
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APASmart Define. (2016). unforgiving thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unforgiving/thesaurus/synonyms
ChicagoSmart Define. 2016. "unforgiving thesaurus" https://smartdefine.org/unforgiving/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, unforgiving thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unforgiving/thesaurus/synonyms>.
MLASmart Define. "unforgiving thesaurus" 24 March 2016. Web. 25 September 2026. <https://smartdefine.org/unforgiving/thesaurus/synonyms>