At first a cloud of impenetrable mystery inwrapt him; then upon the crown of his head a weight began to press.

I s'pose a picture's a picture, to them, and Art an impenetrable mystery.

Your existence can never be suspected; I have taken such precautions, as must render it an impenetrable mystery.

This impenetrable mystery, he said, drove him to become a believer.

I think about this man whenever Americans tell me that Africa is one great impenetrable, illogical mystery.

The profession had awakened quite suddenly to the fact that bovine infertility was no longer an impenetrable mystery.

(Why Sonny isn't named after a food, too, is one of the film's impenetrable mysteries.)

Outsiders find European regulations a great and impenetrable mystery.

But here was an unparalleled opportunity-and an impenetrable mystery.

And a house full of the impenetrable mystery.