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deep
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APASmart Define. (2013). impenetrably thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/impenetrably/thesaurus/synonyms
ChicagoSmart Define. 2013. "impenetrably thesaurus" https://smartdefine.org/impenetrably/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2013, impenetrably thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/impenetrably/thesaurus/synonyms>.
MLASmart Define. "impenetrably thesaurus" 17 June 2013. Web. 25 September 2026. <https://smartdefine.org/impenetrably/thesaurus/synonyms>