impregnably

About 0.01 uses per million words.

Meaning

1. adverb In an impregnable manner; so as to defy attack.

Similar words

unimpugnably unattackably unsinkably unopposably unaccusably unsurmountably unsurpassably undefeatably unmitigably impunibly

Often followed by

fortified entrenched intrenched established in strong the within on