(comparative more unimpregnable, superlative most unimpregnable)
un- + impregnable
"unimpregnable." YourDictionary, n.d. Web. 18 December 2018. <https://www.yourdictionary.com/unimpregnable>.
unimpregnable. (n.d.). Retrieved December 18th, 2018, from https://www.yourdictionary.com/unimpregnable
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