Often he spoke to her in a strange unknown tongue.

He called out to the girl, speaking sharply in an unknown tongue.

Then, without taking his eyes from the general, asked the assassin a question in that same unknown tongue.

A small window opened, through which the guard spoke to an unseen figure in the unknown tongue.

What is it about you that causes me to speak in an unknown tongue?

The stranger spoke impatiently to us in his unknown tongue.

Surely there was more than one unknown tongue on the labels.

I'm not implying that the kids are corresponding in an unknown tongue.

He stared, and then shouted a question back to me in some unknown tongue.

He then addressed a few words to the strangers, but in an unknown tongue.