34 entries under adjective topic. ×

5
impenetrable(clear, open, dense, incomprehensible)
5
impervious(responsive, unable, watertight, enigmatical)
3
airtight(watertight, sealed, enigmatical)
3
dense
2
impassable
2
thick
1
compact
1
watertight
0
Delphic(watertight, enigmatical)
0
bulletproof(watertight, enigmatical)
0
closed to(expression, watertight, enigmatical)
0
dim
0
dull
0
enigmatical
0
expectant
0
fleshy
0
grave
0
gravid
0
grievous
0
hard
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APASmart Define. (2015). penetrable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/penetrable/thesaurus/antonyms
ChicagoSmart Define. 2015. "penetrable thesaurus" https://smartdefine.org/penetrable/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2015, penetrable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/penetrable/thesaurus/antonyms>.
MLASmart Define. "penetrable thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/penetrable/thesaurus/antonyms>