Synonyms|713Antonyms|152|Broader|9Narrower|8Related|663
1
characteristic
1
illegible
1
impervious
1
non-transparent
1
property
1
state(noun, adjective)
1
unaccountable
1
unexplainable
1
unfathomable
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APASmart Define. (2015). impenetrable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/impenetrable/thesaurus/broader
ChicagoSmart Define. 2015. "impenetrable thesaurus" https://smartdefine.org/impenetrable/thesaurus/broader (accessed September 21, 2026).
HarvardSmart Define 2015, impenetrable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/impenetrable/thesaurus/broader>.
MLASmart Define. "impenetrable thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/impenetrable/thesaurus/broader>