Forlorn

When someone is forlorn it means that they not only feel miserable but simultaneously desolate because they also believe they are alone. Forlorn is a very old word in English, and in fact it comes from the Old English word forlesen and means "to lose completely."

Synonyms for forlorn all have fairly sad meanings: disconsolate, pessimistic, despairing, despondent, abandoned, depressed, desperate.