Forlorn (adjective)

1. Feeling lonely and sad because one is abandoned or deserted.
2. Looking or feeling sad and abandoned; pitiable.

Origin:

From the middle english word "forloren" meaning lost or abandoned.

Examples:

1. The abandoned house had a forlorn appearance, with boarded-up windows and a sagging roof.
2. He had a forlorn look on his face as he watched her walk away.
3. The puppy had a forlorn expression as it looked up at her with big eyes.
4. The forlorn children were left alone in the park.
5. He felt forlorn after his best friend moved away.