I frowned thoughtfully for a moment, obviously debating how to answer.

Tom frowned thoughtfully as he helped Bud to his feet.

He frowned thoughtfully and stared at the ground beneath his feet.

He frowned thoughtfully at her; then shook his head slowly.

She turned to face him in the seat, frowning thoughtfully.

She stood looking at it for a moment, frowning thoughtfully.

She came back and sat down on the arm of a chair frowning thoughtfully.

He frowned thoughtfully and scratched at the back of his neck.

The communications officer frowned thoughtfully when the others turned to her.

She frowned thoughtfully, looking for the right words with which to continue.