inexpugnable
adjective
in·ex·pug·na·ble
ˌi-nik-ˈspəg-nə-bəl
-ˈspyü-nə-
1
: incapable of being subdued or overthrown : impregnable
an inexpugnable position
inexpugnableness
noun
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Merriam-Webster unabridged
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