62 entries under adjective topic. ×

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rigorous
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sadistic(cruel, perverted)
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stern
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strict
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truculent
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uncompassionate(mean, hard, disciplined, humanitarian)
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unfeeling
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bitchy
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drastic
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grievous
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hateful(mean, hard)
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horrible
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impatient
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oppressive
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outrageous
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petulant
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rabid
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rugged
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spiteful
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ungiving(mean, hard)
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APASmart Define. (2016). merciful thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/merciful/thesaurus/antonyms
ChicagoSmart Define. 2016. "merciful thesaurus" https://smartdefine.org/merciful/thesaurus/antonyms (accessed September 26, 2026).
HarvardSmart Define 2016, merciful thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/merciful/thesaurus/antonyms>.
MLASmart Define. "merciful thesaurus" 24 March 2016. Web. 26 September 2026. <https://smartdefine.org/merciful/thesaurus/antonyms>