Wiktionary
unpenetrated
a. Not penetrated.
Usage examples of "unpenetrated".
The vessels he had built had all contained such keels, heavy and true and unpenetrated, and this had accounted for the fact that they had not become hog-backed or old before their years.
The night was empty of all terror for them, they had inside their circle an imaginary fire, and needed nothing but their own unpenetrated sense of community.