1. An area that is impossible or extremely difficult to enter, pass through, or access due to physical barriers, dense obstacles, or restricted access
The jungle formed an impenetrable zone that prevented exploration of the interior.
A selva formava uma zona impenetrável que impedia a exploração do interior.
2. A figurative area of knowledge, emotion, or understanding that cannot be easily understood or penetrated
His mind remained an impenetrable zone to those around him.
Sua mente permanecia uma zona impenetrável para quem o rodeava.
3. In military or security contexts, a restricted or fortified area that cannot be breached
The fortress created an impenetrable zone around the city.
A fortaleza criava uma zona impenetrável ao redor da cidade.