The word for today is…
impregnable (adjective):
1: incapable of being taken by assault : unconquerable
2: unassailable, also : impenetrable
Source : Merriam -Webster
Etymology : Impregnable is one of the many English words that bear a French ancestry, thanks to the Norman conquest of England in 1066. It derives from the Middle French verb prendre, which means "to take or capture." Combining prendre with various prefixes has given our language many other words, too, including surprise, reprise, and enterprise. Remarkably, impregnable has a different origin from the similar-looking word pregnant; that word comes from a different Latin word, praegnas, meaning "carrying a fetus."
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