- Definitions|2
- Thesaurus|437
- Abbreviations|0
114 entries under adjective topic. ×
| impenetrable(close, hard, tough, solid) | |
| impervious(hard, solid, fast, short) | |
| tight(close, solid, short, substantial) | |
| compact(close, set, hard, tough) | |
| hermetic(tight, proof, impervious, impenetrable) | |
| waterproof(water, tight, proof, impervious) | |
| close(set, hard, tough, solid) | |
| dense(set, hard, tough, firm) | |
| impassable(solid, dense, unaffected, unyielding) | |
| sealed(tight, proof, impervious, impenetrable) | |
| thick(close, set, hard, tough) | |
| watertight(tight, proof, impervious, impenetrable) | |
| airtight(tight, proof, impervious, impenetrable) | |
| firm(close, hard, solid, fast) | |
| nonporous(hard, solid, rigid, resistant) | |
| imperviable(unaffected, unyielding, unbending, resistant) | |
| hard(set, tough, firm, solid) | |
| proof(tight, impervious, hermetic) | |
| closed | |
| heavy(hard, solid, rigid) |
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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> |