- Definitions|2
- Thesaurus|928
- Abbreviations|0
292 entries under adjective topic. ×
| impenetrable(set, hard, tough, solid) | |
| resistant(strong, tough, resist, sturdy) | |
| impermeable(hard, solid, fast, short) | |
| callous(noun, calm, bad, cold) | |
| immune(resist, unaffected, unyielding, unbending) | |
| inaccessible(unreasonable, useless, out, absurd) | |
| impassable(solid, unreasonable, useless, absurd) | |
| tight(proof, dense, unyielding, unbending) | |
| hermetic(solid, fast, short, dense) | |
| indifferent(calm, restrained, detached, apathetic) | |
| insensible(bad, cold, indifferent, aloof) | |
| insensitive(noun, bad, cold, detached) | |
| invulnerable(secure, safe, unaffected, unyielding) | |
| imperviable(unyielding, unbending, unable, unreceptive) | |
| proof(calm, resist, restrained, fast) | |
| unaffected(unresponsive, unyielding, unbending, unable) | |
| hardened(noun, set, hard, tough) | |
| unresponsive(calm, bad, cold, indifferent) | |
| watertight(fast, short, unyielding, unbending) | |
| airtight |
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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> |