The whole idea of open country was completely unknown to them; they were forest folk.

How, after all, do you train to face a completely unknown world?

A completely unknown type of civilization must have developed itself here.

They faced a completely unknown future by following this course.

He was in command of a crew who were completely unknown to him.

It has its own electrical power plant, and is completely unknown to the rest of the world.

He could be a shadowy figure completely unknown to the public at large, and it would make no difference.

On 3 May the team passed into completely unknown land.

It wasn't as though the murder victim was completely unknown.

It is clear that the long-term effects of this process are completely unknown.