There was another crowded silence, the kind that gets made by lots of people thinking unhappy thoughts.

Her attention moved back toward the man, and she put the unhappy thought about leaving out of her mind.

He pushed open the front door and headed for home, walking slowly, lost in his unhappy thoughts.

An even more unhappy thought occurred to her then.

As Sylvia was carried into the ship, she had a final unhappy thought.

Maybe it would be better to stay away, and leave them to their unhappy thoughts.

His unhappy thoughts were interrupted by a knock on the door, and he started.

And his own unhappy thoughts kept him awake more often than not.

These unhappy thoughts kept him awake for a long time.

She closed her eyes on the unhappy thought, and hardly slept at all.