1She looked at the old photographs with a wistful expression, remembering her childhood.
2Is it a wistful thought to think that we could have changed the course of events?
3The smell of freshly baked cookies brought back wistful memories of her grandmother's kitchen.
4If only we could turn back time, but that's just a wistful thought.
5There was a wistful quality to his voice as he sang about lost love.