In spite of her serious air she did not look old beyond her years.

Life, since the fall in wages, had begun to appear to them with a more serious air.

I quite liked the effect, as it gave a more serious air to her pretty, but usually blank face.

The clientele seemed to have a more serious air.

She took a breath, adopting a more serious air.

Monterey had a more serious, less triumphant air these days.

"Two diamonds," she said with the serious air of a card shark in training.

He did it with a grave, serious air, listening intently to the sound of his own voice.

Finally, she came to stop beside him and looked up at him with a serious, troubled air.

His little black bag and serious air marked him out as a doctor.