impenetrable in a sentence

a.

Definition

Sample Sentences

1. The ancient fortress stood tall and impenetrable against the fierce storms that battered its walls.
2. Despite their best efforts, the detectives found the suspect's alibi to be impenetrable, leaving them with more questions than answers.
3. Her emotional armor was impenetrable, shielding her from the hurt of past relationships.
4. The dense fog enveloped the forest, creating an impenetrable barrier that obscured any path forward.
5. The scientist's theories were so complex that they seemed impenetrable to those unfamiliar with the subject.