- Definitions|2
- Thesaurus|437
- Abbreviations|0
| jam-packed(adjective, close, solid, short, substantial) | |
| massive | |
| opaque | |
| packed(adjective, close, solid, short, substantial) | |
| resistant(adjective, proof, unaffected, unyielding, unbending) | |
| retentive(adjective, tight, proof, impervious, hermetic) | |
| serried | |
| thickset | |
| unpierceable(unaffected, unyielding, unbending, resistant, unreceptive) | |
| water-resistant(adjective, impenetrable) | |
| water-tight(adjective, tight, proof, impervious, hermetic) | |
| air-locked(adjective, tight, proof, impervious, hermetic) | |
| air-proof(adjective, tight, proof, impervious, hermetic) | |
| airproof(adjective, tight, proof, impervious, hermetic) | |
| close-grained(adjective, close, set, hard, tough) | |
| close-knit | |
| close-textured | |
| close-woven | |
| coherent | |
| cohesive |
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| APA | Smart Define. (2015). impermeable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/impermeable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "impermeable thesaurus" https://smartdefine.org/impermeable/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, impermeable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/impermeable/thesaurus/synonyms>. |
| MLA | Smart Define. "impermeable thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/impermeable/thesaurus/synonyms> |