The guard focused one eye back at her with a dubious expression.

Some of the other men looked at Max with dubious expressions.

Through the wall he watched their dubious expressions as they examined it.

At Angel's dubious expression, he picked up the box and shoved it toward him.

Scott looked at the staff officer with a dubious expression.

His dubious expression suggested he was worried she was going to make a scene or ask for more money.

Then Dak turned to me with a dubious but hopeful expression.

And she often has the dubious expression of a person who isn't entirely convinced she's got a place on any map.

I probably had a dubious expression on my face.

And looking around me, I saw a lot of other dubious expressions.