A speaker of a language unknown to him would be brought in to work with Pike.

She began to chant in a language unknown to me.

Signs in some unknown language pointed south down the fork.

Then her lips parted, and from them came once more the sound of the unknown language.

The two larger ones were in an unknown language, and he set them aside.

One of the young men said something in an unknown language.

Her glimpse had suggested a pattern, as if those were words in an unknown language.

She also sang a spiritual in what seemed to be an unknown language.

And here again I find myself writing in an unknown language, so far as my younger readers are concerned.

The other three looked at her as though she had spoken in an old and now unknown language.