40 entries under adjective topic. ×

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brutal(mean, hard, harsh, cold)
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cold(mean, hard, harsh, indifferent)
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combative(spirited, aggressive, ambitious, competing)
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competing(spirited, aggressive, ambitious, bloodthirsty)
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competitive
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dog eat dog(expression, idiom, rival, ambitious)
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emulous(spirited, aggressive, ambitious, competing)
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hardhearted(mean, hard, harsh, cold)
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harsh(mean, hard, cold, indifferent)
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indifferent(mean, hard, harsh, cold)
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killer(spirited, aggressive, ambitious, competing)
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mean(hard, harsh, cold, indifferent)
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obdurate(mean, hard, harsh, cold)
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opposing(spirited, aggressive, ambitious, competing)
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pitiless(care, mercy)
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relentless(mean, hard, harsh, cold)
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rival(spirited, aggressive, ambitious, competing)
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savage(mean, hard, harsh, cold)
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streetwise(spirited, aggressive, rival, ambitious)
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vying(spirited, aggressive, rival, ambitious)
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APASmart Define. (2011). killer instinct thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/killer_instinct/thesaurus/synonyms
ChicagoSmart Define. 2011. "killer instinct thesaurus" https://smartdefine.org/killer_instinct/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2011, killer instinct thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/killer_instinct/thesaurus/synonyms>.
MLASmart Define. "killer instinct thesaurus" 23 May 2011. Web. 24 September 2026. <https://smartdefine.org/killer_instinct/thesaurus/synonyms>