At least, the younger man looked impassive, at first glance.

Atvar did his best to look impassive, no matter how he writhed inside.

Next to him at the gunner's station, Rodek looked more impassive.

The girl waved, and two guys, mediocre in appearance, showed up, looking impassive.

The nearest guard tried hard to look impassive, all the while watching her with his mouth half open.

She looked at him from the holodisplay and seemed to be trying to look impassive, but she could not quite manage it.

She and Red sat up and tried to look impassive.

The big black narrowed his eyes, and went back to looking impassive.

He looks impassive, but agrees to talk and speaks in a strong Mexican accent.

I tried to look impassive the way the Colonel does.