64 entries under unsympathetic topic. ×

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unaffected(adjective, hard, unfeeling, hardened)
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unconcerned(adjective, hard, unfeeling, hardened)
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unimpressionable(adjective, hard, unfeeling, hardened)
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unresponsive(adjective, hard, unfeeling, hardened)
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APASmart Define. (2015). impenetrable thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/impenetrable/thesaurus/synonyms
ChicagoSmart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2015, impenetrable thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/impenetrable/thesaurus/synonyms>.
MLASmart Define. "impenetrable thesaurus" 10 April 2015. Web. 1 October 2026. <https://smartdefine.org/impenetrable/thesaurus/synonyms>