Inexpugnable
/ˌɪnɛkˈspʌɡnəbəl/
"Inexpugnable" in a Sentence (3 examples)
My one hope of the world, my inexpugnable consolation in looking at the miseries of the world, is that this is altering.
It crept into one's mind, a distress as vague and inexpugnable as a sea fog on a spring morning, and presently one shivered and wanted to go indoors...
This seemed to be an inexpugnable refuge, where we could live untroubled and learn to know each other."