Wistful – Sad because you want something you can't have
Whist against someone who is wonderful (wistful) at the game makes me sad because I know I can't be as good.
Examples of wistful in a sentence
She had a wistful look in her eyes as she stared at the diamond bracelet, knowing she could never afford it.
His new song was a wistful homage to his childhood pet.
The old woman had a wistful expression as she thought about all the places she wished she'd visited in her youth.