When she opened her eyes, he was again the glacial nobleman, his face an impenetrable mask.

He held her inquisitive look, certain he presented an impenetrable mask.

But once again she saw the fury glowing in his eyes, and the impenetrable mask his face had become.

He was the shortest and slimmest, his Oriental face an impenetrable mask.

His face wore its calm, impenetrable mask as he flung himself into the water.

His face an impenetrable mask, he looked at Dennis.

It had probably taken years for her face to mold itself into such an impenetrable mask.

He thought he heard her laugh behind the impenetrable mask.

The impenetrable mask was gone for a moment, and his face expressed deep emotion.

Then it was gone, replaced by the impenetrable mask of drunken indifference.