Something that cannot be penetrated or destroyed, such as, "The
fortress was impregnable to all attacks."
How do you use the word impregnable in a sentence?
Made out of concrete and lead, the fallout shelter seemed
impregnable.
They built stout castles in the middle ages believing them
impregnable, until gunpowder came into use.
Is 'During the battle it was impregnable to enter the opposing fort' a sentence?
No. The word impregnable already means "impossible to enter."You can replace the word impregnable with "impossible." If you still want to use the word, you can say"The opposing fort proved impregnable during the battle."Having the clause first is unwieldy.
How do you use impregnable in a sentence?
Impregnable means incapable of being taken by assault.
Although they tried to attack the castle, the enemies found our
castle walls to be impregnable, so they stopped their attack before
nightfall.