- Definitions|2
- Thesaurus|1.4k
- Abbreviations|0
| impassive(adjective, hard, careless, indifferent, cruel) | |
| impenetrable(adjective, hard, unfeeling, unsympathetic, hardened) | |
| impenitent(adjective, hard, careless, indifferent, cruel) | |
| impious(adjective, hard, unfeeling, unsympathetic, hardened) | |
| inaccessible(adjective, hard, unfeeling, unsympathetic, hardened) | |
| incrusted | |
| indifferent(adjective, hard, careless, cruel, apathetic) | |
| indurate | |
| inflexible(adjective, hard, careless, indifferent, cruel) | |
| insensible(adjective, hard, careless, indifferent, cruel) | |
| insentient(adjective, hard, careless, indifferent, cruel) | |
| irreverent(adjective, hard, unfeeling, unsympathetic, hardened) | |
| lapidified | |
| leathery | |
| numb | |
| obdurate(adjective, hard, careless, indifferent, cruel) | |
| obtuse(noun, adjective, hard, unfeeling, unsympathetic) | |
| ossified | |
| petrified | |
| prepared(adjective, hard, unfeeling, unsympathetic, experienced) |
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| APA | Smart Define. (2015). toughened thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/toughened/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "toughened thesaurus" https://smartdefine.org/toughened/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, toughened thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/toughened/thesaurus/synonyms>. |
| MLA | Smart Define. "toughened thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/toughened/thesaurus/synonyms> |