in an impregnable manner
"the sight of that bland, impregnably righteous face has been enough to make their blood run cold"
In an impregnable manner; in a manner to defy attack.
Military Dictionary and Gazetteer
In an impregnable manner; in a manner to defy force; as, a place impregnably fortified.
The numerical value of impregnably in Chaldean Numerology is: 8
The numerical value of impregnably in Pythagorean Numerology is: 5