- Definitions|2
- Thesaurus|1.5k
- Abbreviations|0
308 entries under adjective topic. ×
| hard-bitten(hard, unfeeling, unsympathetic, hardened) | |
| hard-boiled(hard, unfeeling, unsympathetic, hardened) | |
| hardhearted(hard, cruel, unfeeling, unsympathetic) | |
| heartless(hard, cruel, unfeeling, unsympathetic) | |
| huge | |
| impassive(hard, unfeeling, unsympathetic, hardened) | |
| impious(hard, unfeeling, unsympathetic, prepared) | |
| indivisible | |
| indurated(set, hard, firm, stiff) | |
| intractable | |
| intricate | |
| inured(hard, unfeeling, unsympathetic, hardened) | |
| involved | |
| irreverent(hard, unfeeling, unsympathetic, prepared) | |
| jelled(set, hard, tough, solid) | |
| jellied(set, solid, heavy, deep) | |
| knotty | |
| labored | |
| laborious | |
| leaden |
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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> |