(adjective) sad, unhappy, lonely, miserable, dismal, bleak, depressed, gloomy, deplorable, mournful, sorrowful, moody, dispirited, morbid, somber, desolate, plaintive, regretful, dejected, blue, sombre, untoward, glum, unfortunate, solitary, black, doleful, downcast, sullen, joyless, disconsolate, down, elegiac, spiritless, gaunt, melancholic, lugubrious, melancholy, sober, lonesome, mirthless, funereal, rueful, downhearted, dour, woeful, woesome, tristful, cheerless, dreary, dumpish, sentimental, chap-fallen, heavy-hearted or low-spirited (verb) sorrow, regret, grieve or sadden (noun) low or cast (phrase) feel blue or in the doldrums