He looked unusually serious and I felt a twinge of apprehension.

He seemed unusually serious, and his eyes held a look of expectancy colored with doubt.

"I have reason to hate him," said Bane, his expression unusually serious.

Sam was standing in the doorway, his bruised face unusually serious.

"You say we are the same," he said, in a tone that sounded unusually serious.

Either they have already had surgery or an unusually serious muscle injury.

She looked up in surprise to see Jason with an unusually serious expression on his face.

Older people who had him as a teacher, say that he was unusually serious in school.

Nilani sat down across from him, her sweet face unusually serious.