The phrase "impenetrable for" is correct and can be used in written English.
It is typically used to describe something that is difficult or impossible to understand or get through. Example: The dense fog made the woods impenetrable for the hikers, causing them to get lost.
Forests had been impenetrable for thousands of years.
Overnight, the centre of Groningen became impenetrable for cars.
But some say the system is still impenetrable for too many.
It's invitation-only, and largely impenetrable for those not counted among the global elite.
He also photographed famous visitors, including Bob Dylan, who was sitting, bored and impenetrable, for a Warhol screen test.
Thus, even after 106 impacts the coating was proved to be still impenetrable for an electrolyte that could lead to corrosion of the substrate.
But RIM's reputation for producing apparently impenetrable security for high-profile customers is at risk of being irreparably damaged by these new demands.
For some, this is an impenetrable barrier for agents such as HIV, but Langerhans cells within the squamous layer have been shown to transmit the virus for target cells [ 20].
"We can rest assured that our skulls will remain an impenetrable barrier for any would-be technological mind hacker for any foreseeable future," he added.
Die Welt's publisher, Stefan Aust, has no doubt that the vote was a "come-uppance for Brussels, whose policies are ever more impenetrable, and for the high-handedness of a bureaucracy whose decision-making process are increasingly removed from the public".
The very characteristics that account for hawala's success have made it an impenetrable haven for illicit and criminal transactions.
