Synonyms|38Antonyms|1|Broader|0Narrower|0Related|0
1
impenetrable(adjective, dense)
0
Delphic
0
arcane
0
baffling
0
bulletproof
0
cabalistic
0
close
0
compact
0
dense
0
enigmatic
0
enigmatical
0
firm
0
hard
0
hermetic
0
hidden
0
impassable
0
impermeable
0
impervious
0
incognizable
0
incomprehensible
<12>
For more, visit Unpiercable on Power Thesaurus
15 years ago|223 views|share |citing 
APASmart Define. (2011). unpiercable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/unpiercable/thesaurus/synonyms
ChicagoSmart Define. 2011. "unpiercable thesaurus" https://smartdefine.org/unpiercable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2011, unpiercable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/unpiercable/thesaurus/synonyms>.
MLASmart Define. "unpiercable thesaurus" 23 May 2011. Web. 21 September 2026. <https://smartdefine.org/unpiercable/thesaurus/synonyms>