It might refer to one that is so thick, or so dense, that light won't go through it.
The legendary stone said to be of impenetrable hardness and sometimes identified with diamond is the legendary gemstone "adamant." In ancient lore, adamant was believed to possess incredible strength and resilience, leading to its association with the impenetrable qualities of diamond.
The legendary stone that is said to be of impenetrable hardness is the Philosopher's Stone. It is believed to have the power to transmute base metals into gold and grant eternal life.
The layer of soil that is made up of impenetrable rock is known as the bedrock layer. This layer is located beneath the topsoil and subsoil layers, and it acts as a barrier to root growth and water penetration.
Nimbus means "rain" when added to a cloud's name.
When "nimbo" is added to a cloud term, such as "nimbostratus" or "cumulonimbus," it indicates that the cloud is capable of producing precipitation. "Nimbo" refers to rain or precipitation, so clouds with this prefix typically bring wet weather.
The steel curtain
Opaque.
The phrase "wrapped in an impenetrable mist" could mean that the area is covered in thick fog that you can't see through. If it is being used symbolically, it could mean that an area is undiscovered, or even that someone is unable to think straight (as in "my mind was wrapped in an impenetrable mist").
The phrase "wrapped in an impenetrable mist" could mean that the area is covered in thick fog that you can't see through. If it is being used symbolically, it could mean that an area is undiscovered, or even that someone is unable to think straight (as in "my mind was wrapped in an impenetrable mist").
a dark hole in space
Impenetrable- The fort's defenses were thought to be impenetrable.
His skin was impenetrable, Impenetrable means difficult to get through such as a forest or your skin. the forest was impenetrable and it took me hours to get through.
IMPENETRABLE : unable to be penetrated or breached, impassable, impervious Example : "The concrete dam was an impenetrable obstacle for the fish." The word is used metaphorically for apparently unbeatable blockages or impediments. A book or written form may be "impenetrable" when it cannot be directly understood, or a determined bloc of voters may present an "impenetrable" opposition to an attempt to pass a law.
His shield was made of an impenetrable material.
The man had impenetrable metal skin, incapable of being pierced.
Bwindi Impenetrable National Park was created in 1991.
Impenetrable is more of an Adjective, it's used to describe a trait, or as in Impenetrable, it's describing how something cannot be penetrated. Penetrate itself would be a verb.