Words similar to impenetrable

Example sentences for: impenetrable

How can you use “impenetrable” in a sentence? Here are some example sentences to help you improve your vocabulary:

But the absence of workaday and historical detail keeps the reader at a distance; many of Morrison's characters are impenetrable to the mind's eye.
It’s not hard to understand why the fortress proved virtually impenetrable.
How is it possible that such a future-predicting code embedded in such an impenetrable form in an ancient document could be the work of something less than God?
3) It celebrates impenetrable highbrow books, such as Joyce's Ulysses , which critics admit to never having read.
Jon Katz broods in the isolation of his suburban basement office, apparently limiting his contact to the outside world to e-mail from other self-pitying souls: He composed his Victims' Manifesto, that impenetrable screed called Virtuous Reality.