impregnable

3 definitions • 3 examples

A building or other place that is impregnable is so strongly built and/or defended that it cannot be entered by force:

Despite burglar alarms and window locks, homes are never impregnable against determined thieves.

powerful and impossible to beat, especially in sport:

impregnable lead Surrey have been building up an impregnable lead in this season's County Championship.

so strongly made that it cannot be broken into or taken by force:

an impregnable fortress