The guard frowned dubiously.

Mr. Smith frowned dubiously and said, "The resemblance isn't really very close, is it?"

"All right," he said, frowning dubiously.

Kyle frowned dubiously and leaned back in his chair.

The priest frowned dubiously.

Now it was Sparky's turn to frown dubiously.

David frowned dubiously and poked his finger through the hole which represented the eye of the king of beasts.

I looked him up and down, frowning dubiously, The glint was still in his eye.

He frowned dubiously, but with one eye still on me, looked back.

- She frowned dubiously, hesitating at the door.