impregnability

That is an astonishing spell of impregnability, one that looked set to last through to a penalty shoot-out tonight.

The power she possessed over him seemed exactly in proportion to his impregnability to every one else.

Every moment's reflection but convinces us of the absolute impregnability of the Southern position on this subject.

What a figment of the imagination this boasted impregnability of the Bank of England was the sequel will show.

Nay, to him he even relaxed in some degree his strongest, and most guarded point of impregnability—his purse strings.

I have more than once been astonished at the real impregnability of the retreats selected by wounded bison.