- Definitions|2
- Thesaurus|928
- Abbreviations|0
| unreceptive(adjective, unyielding, unbending, unable, disinclined) | |
| unsympathetic(adjective, bad, cold, indifferent, detached) | |
| apathetic(adjective, indifferent, detached, distant, unfeeling) | |
| closed | |
| closed to(expression, adjective, unyielding, unbending, unable) | |
| cold(adjective, calm, indifferent, restrained, detached) | |
| deaf | |
| emotionless(adjective, bad, cold, aloof, no feelings) | |
| frigid | |
| hard-boiled(noun, adjective, calm, bad, cold) | |
| hard-hearted(adjective, calm, bad, cold, restrained) | |
| impregnable(adjective, secure, safe, snug, intact) | |
| inflexible(adjective, hard, tough, solid, rigid) | |
| leakproof(adjective, watertight) | |
| soundproof | |
| steely | |
| thick(adjective, hard, solid, rigid, dense) | |
| tough(noun, adjective, set, strong, hard) | |
| unconcerned(adjective, calm, indifferent, restrained, detached) | |
| unpassable |
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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> |