| inaccessible(adjective, hard, unfeeling, unsympathetic, prepared) | |
| incrusted | |
| indifferent(adjective, hard, careless, cruel, apathetic) | |
| inflexible(adjective, hard, careless, indifferent, cruel) | |
| insensate(noun, adjective, hard, careless, indifferent) | |
| insensible(adjective, hard, careless, indifferent, cruel) | |
| insentient(adjective, hard, careless, indifferent, cruel) | |
| intolerant | |
| irreverent(adjective, hard, unfeeling, unsympathetic, prepared) | |
| lapidified | |
| lost to shame(expression, idiom) | |
| mulish | |
| naturalized | |
| numb(noun, verb, dull, develop, blunt) | |
| obtuse(noun, adjective, hard, unfeeling, unsympathetic) | |
| opinionated | |
| orientated | |
| oriented | |
| ossified | |
| overzealous |
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| APA | Smart Define. (2015). case-hardened thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/case-hardened/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "case-hardened thesaurus" https://smartdefine.org/case-hardened/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, case-hardened thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/case-hardened/thesaurus/synonyms>. |
| MLA | Smart Define. "case-hardened thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/case-hardened/thesaurus/synonyms> |