200 entries under adjective topic. ×

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truculent
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unabated(persistent, constant, prearranged, dogged)
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unbending(cruel, pitiless, merciless, ruthless)
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unbroken(persistent, constant)
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uncalled-for(unsparing, inhumane)
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uncalled for
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uncompromising(cruel, pitiless, merciless, ruthless)
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unfeeling(mean, harsh, cruel, vicious)
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unflinching(cruel, pitiless, merciless, ruthless)
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unimpressible(prearranged, dogged, unabated)
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unpermissive(tough, rigid, scrupulous, disciplined)
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unpitying(unsparing, inhumane)
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unremitting(persistent, constant)
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unsparing
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unsympathetic(mean, harsh, cruel, vicious)
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unwavering(persistent, constant)
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uptight(tough, rigid, scrupulous)
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valid(stiff, strict, demanding)
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vicious(mean, harsh, cruel, brutal)
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wanton(unsparing, inhumane)
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APASmart Define. (2015). ironfisted thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/ironfisted/thesaurus/synonyms
ChicagoSmart Define. 2015. "ironfisted thesaurus" https://smartdefine.org/ironfisted/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, ironfisted thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/ironfisted/thesaurus/synonyms>.
MLASmart Define. "ironfisted thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/ironfisted/thesaurus/synonyms>