Sophie's soft features grew surprisingly stern as she leaned in.

Her tone grew protective and stern as she denied that his celebrity had allowed him to cut in line.

Then his face grew stern as he went on.

The place where he'd always said he'd like to settle when the road grew too stern for his bones.

His face grew more stern and disapproving as the moments passed.

Then, all at once, he grew stern and big-brotherly toward me.

Zawas was not amused by her argument, she could see, and his face grew more stern in the flashing light.

Her lovely grey eyes grew stern; suddenly Cato looked out of them.

His face grew very serious and stern as his dark eyes looked into hers.

When he was asked about this he grew stern and changed the subject.