It was hard to judge when the girl seemed determined to show an impassive face to the world.

What was going on behind those black eyes, that impassive face?

Within a moment he smiled deep inside, although his impassive face showed nothing.

They are a race possessed of a single impassive face.

Matt, his face impassive, turned back to look out at sea.

The Doctor looked from one impassive face to the other.

He turned away from her now impassive face and said, "Okay, thanks."

A lot of things to call him came to mind as I glared at his impassive face.

His impassive face tried to twist in on itself as he felt the pain well up from within.

She was a pretty girl, too, with lively eyes in an impassive face.