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behaviour(verb, adjective)
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character trait
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characteristic
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heartless
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APASmart Define. (2016). unmerciful thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unmerciful/thesaurus/broader
ChicagoSmart Define. 2016. "unmerciful thesaurus" https://smartdefine.org/unmerciful/thesaurus/broader (accessed September 22, 2026).
HarvardSmart Define 2016, unmerciful thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unmerciful/thesaurus/broader>.
MLASmart Define. "unmerciful thesaurus" 31 March 2016. Web. 22 September 2026. <https://smartdefine.org/unmerciful/thesaurus/broader>