- Definitions|2
- Thesaurus|928
- Abbreviations|0
53 entries under solid topic. ×
| impenetrable(adjective, set, hard, tough) | |
| impermeable(adjective, hard, fast, short) | |
| impassable(adjective, unreasonable, useless, absurd) | |
| hermetic(adjective, fast, short, dense) | |
| hardened(noun, adjective, set, hard, tough) | |
| compact(adjective, set, hard, tough) | |
| firm(adjective, set, strong, hard, tough) | |
| unyielding(adjective, hard, tough, rigid) | |
| hard(adjective, set, tough, firm) | |
| inviolable(adjective, secure, safe, dense) | |
| inflexible(adjective, hard, tough, rigid) | |
| thick(adjective, hard, rigid, dense) | |
| tough(noun, adjective, set, strong, hard) | |
| close(adjective, set, hard, tough) | |
| dense(adjective, set, hard, tough) | |
| rigid(adjective, hard, tough, detached) | |
| stiff(adjective, set, hard, tough) | |
| caked(adjective, set, heavy, deep) | |
| clabbered(adjective, set, heavy, deep) | |
| clotted(adjective, set, heavy, deep) |
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| APA | Smart Define. (2015). impervious thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/impervious/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impervious thesaurus" https://smartdefine.org/impervious/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, impervious thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/impervious/thesaurus/synonyms>. |
| MLA | Smart Define. "impervious thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/impervious/thesaurus/synonyms> |