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impenetrable
01
not capable of being entered, pierced, or passed through
02
extremely difficult to fully comprehend
03
permitting little if any light to pass through because of denseness of matter
Example
The security measures in place were designed to create an impenetrable barrier against unauthorized access.
The thick fog made the forest impenetrable, obscuring visibility.
The dense jungle was virtually impenetrable, with dense foliage blocking any attempts at passage.
The emotional barrier she erected around herself seemed impenetrable, preventing others from getting close.
The fortress was surrounded by an impenetrable wall, making it difficult for invaders to breach.
