- Definitions|2
- Thesaurus|540
- Abbreviations|0
34 entries under adjective topic. ×
| impenetrable(clear, open, dense, incomprehensible) | |
| impervious(responsive, unable, watertight, enigmatical) | |
| airtight(watertight, sealed, enigmatical) | |
| dense | |
| impassable | |
| thick | |
| compact | |
| watertight | |
| Delphic(watertight, enigmatical) | |
| bulletproof(watertight, enigmatical) | |
| closed to(expression, watertight, enigmatical) | |
| dim | |
| dull | |
| enigmatical | |
| expectant | |
| fleshy | |
| grave | |
| gravid | |
| grievous | |
| hard |
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| APA | Smart Define. (2015). penetrable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/penetrable/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "penetrable thesaurus" https://smartdefine.org/penetrable/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, penetrable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/penetrable/thesaurus/antonyms>. |
| MLA | Smart Define. "penetrable thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/penetrable/thesaurus/antonyms> |