He still looked too serious, and she needed his smile.

She looked more serious than he thought he'd ever seen her.

She came back in a few minutes, looking very serious.

He would have given a great deal to know why they were all looking so serious.

In some ways, she had never seen him look less serious.

Don't look so serious or I won't let you go.

Yet when he stopped and looked serious, so did everybody else.

Am I doing it to make myself look more serious?

Do some work to make them look more serious, please.

For the first time, she looked old and very serious.