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inexorable
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inflexible
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inhuman
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inquisitorial
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magisterial
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mean
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merciless
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obdurate
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painstaking
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peremptory
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pitiless
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positive
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precisian
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punitive
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relentless
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rigid
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rigorous
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ruthless
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savage
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APASmart Define. (2013). iron-handed thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/iron-handed/thesaurus/synonyms
ChicagoSmart Define. 2013. "iron-handed thesaurus" https://smartdefine.org/iron-handed/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2013, iron-handed thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/iron-handed/thesaurus/synonyms>.
MLASmart Define. "iron-handed thesaurus" 19 May 2013. Web. 1 October 2026. <https://smartdefine.org/iron-handed/thesaurus/synonyms>