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1
impenetrable
For more, visit Unpiercable on Power Thesaurus
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APASmart Define. (2011). unpiercable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unpiercable/thesaurus/synonyms
ChicagoSmart Define. 2011. "unpiercable thesaurus" https://smartdefine.org/unpiercable/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2011, unpiercable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unpiercable/thesaurus/synonyms>.
MLASmart Define. "unpiercable thesaurus" 23 May 2011. Web. 26 September 2026. <https://smartdefine.org/unpiercable/thesaurus/synonyms>