- Definitions|2
- Thesaurus|1.5k
- Abbreviations|0
308 entries under adjective topic. ×
| overweight | |
| sealed(fast, short, unaffected, unyielding) | |
| secret(obscure, dark, superior, strange) | |
| secure | |
| smoky(dark, gloomy, dirty, dreary) | |
| solidified(set, hard, tough, solid) | |
| sonorous | |
| stiff(set, hard, tough, firm) | |
| supernatural(obscure, dark, mysterious, spiritual) | |
| unseen(hidden, latency implication) | |
| unsusceptible(hard, unfeeling, unsympathetic, hardened) | |
| watertight(fast, short, unaffected, unyielding) | |
| Delphic | |
| accustomed(hard, unfeeling, unsympathetic, prepared) | |
| benumbed(hard, unfeeling, unsympathetic, prepared) | |
| blurred | |
| bulletproof | |
| caked(set, solid, heavy, deep) | |
| case-hardened(hard, unfeeling, unsympathetic, prepared) | |
| clabbered(set, solid, heavy, deep) |
For more, visit
Impenetrable on
Power Thesaurus
| 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> |