Definition: unable to be entered
Part of Speech: Adjective
Synonym(s): indestructible, impenetrable
Antonym(s): destructible, penetrable
1. Because the architect wanted his home to be impregnable to the worst types of weather, he built his dwelling using the strongest materials.
2. Enemy forces found it impossible to enter the impregnable fort.
3. We lost the game because our opponent’s defense was impregnable.