The queen became thoughtful and smiled, like a woman to whom duplicity is no stranger.

Even so, he found himself becoming increasingly thoughtful about the nature of his office.

They laughed together for a few moments and became thoughtful.

Bob stared about the gloomy room and became thoughtful.

But then the man's expression changed and became thoughtful.

She had become very thoughtful, although she had said nothing.

Suddenly she stood still before the glass and became serious and thoughtful.

Soon after this discovery, he became more thoughtful than usual for several days, and seemed much engrossed by one subject.

He changed his act at the station, however, becoming thoughtful and considerate.

Not softening so much as simply becoming more thoughtful.