adj. 25B6; adjective
he sounded forlorn : UNHAPPY, sad, miserable, sorrowful, dejected, despondent, disconsolate, wretched, abject, down, downcast, dispirited, downhearted, crestfallen, depressed, melancholy, gloomy, glum, mournful, despairing, doleful, woebegone; informal blue, down in the mouth, down in the dumps, fed up; formal lachrymose.
a forlorn garden : DESOLATE, deserted, abandoned, forsaken, forgotten, neglected.
a forlorn attempt : HOPELESS, with no chance of success; useless, futile, pointless, purposeless, vain, unavailing, nugatory; archaic bootless.
happy, busy, cared for, hopeful, sure-fire.