31 entries under adjective topic. ×
| impermeable | |
| impenetrable | |
| compact | |
| nonporous | |
| impervious | |
| airtight | |
| tight | |
| piercing | |
| close | |
| dense | |
| impassable | |
| waterproof | |
| watertight | |
| leakproof | |
| selfish | |
| consistent | |
| constipated | |
| costive | |
| formal | |
| hermetic |
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| APA | Smart Define. (2015). porous thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/porous/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "porous thesaurus" https://smartdefine.org/porous/thesaurus/antonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, porous thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/porous/thesaurus/antonyms>. |
| MLA | Smart Define. "porous thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/porous/thesaurus/antonyms> |