(comparative more unpenetrable, superlative most unpenetrable)
un- + penetrable
"unpenetrable." YourDictionary, n.d. Web. 12 December 2018. <https://www.yourdictionary.com/unpenetrable>.
unpenetrable. (n.d.). Retrieved December 12th, 2018, from https://www.yourdictionary.com/unpenetrable
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