Marj was thoughtfully silent for a while before she let out a low whistle and said, "This is weird."

He was thoughtfully silent for a moment.

He was thoughtfully silent for a few minutes.

He had seemed utterly sure of himself until he came to the end, but when George sat thoughtfully silent he couldn't stand the strain.

The subject was continued no farther; and Marianne remained thoughtfully silent, till a new object suddenly engaged her attention.

He remained thoughtfully silent during the rest of the slow way to Cyclopedia Square.

He was thoughtfully silent for a moment, then said briskly to Cumber, 'Take three men and lower the boat.

Jules was thoughtfully silent for a long while.

The man was thoughtfully silent for a moment, then said, "Thanks, but I'd rather let matters stand as they are.

"Maybe they already have," Skarnu said, which kept his companion thoughtfully silent for quite a while.