- Definitions|2
- Thesaurus|1.5k
- Abbreviations|0
68 entries under hardened topic. ×
| tough(adjective, hard, firm, solid, stiff) | |
| adamantine(adjective, set, tough, firm, stiff) | |
| hard(adjective, tough, firm, solid, cruel) | |
| inaccessible(adjective, hard, unfeeling, unsympathetic, prepared) | |
| stony(adjective, hard, firm, stiff, unfeeling) | |
| rocky(adjective, set, firm, stiff, compact) | |
| inflexible(adjective, set, strong, hard, tough) | |
| resistant(adjective, hard, unfeeling, unsympathetic, prepared) | |
| callous(adjective, set, hard, firm, stiff) | |
| insensible(adjective, hard, unfeeling, unsympathetic) | |
| obtuse(adjective, hard, unfeeling, unsympathetic, prepared) | |
| stiff(adjective, set, hard, tough, firm) | |
| unsusceptible(adjective, hard, unfeeling, unsympathetic) | |
| accustomed(adjective, hard, unfeeling, unsympathetic, prepared) | |
| benumbed(adjective, hard, unfeeling, unsympathetic, prepared) | |
| case-hardened(adjective, hard, unfeeling, unsympathetic, prepared) | |
| coldhearted(adjective, hard, unfeeling, unsympathetic, prepared) | |
| contemptuous(adjective, hard, unfeeling, unsympathetic, prepared) | |
| cruel(adjective, hard, unfeeling, unsympathetic) | |
| disdainful(adjective, hard, unfeeling, unsympathetic, prepared) |
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| APA | Smart Define. (2015). impenetrable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/impenetrable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, impenetrable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/synonyms>. |
| MLA | Smart Define. "impenetrable thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/impenetrable/thesaurus/synonyms> |