One or two unknown faces, and some at the back he couldn't see.

Perhaps the things she had seen made her unwilling to look frankly into unknown faces.

Some unknown face appeared at the head of the stairs.

"If you bring in an unknown face in this neighborhood, we'll know right away."

My love with the unknown face was at hand.

They came to the last of the unknown faces.

She looked into the unknown face of the man who was holding her.

Fees are also generally lower, so an unknown face entails less risk for a client.

That was fortunate, for in a camp this size an unknown face would be noticed immediately.

There would be nothing to learn from his face, known or unknown.