1. unhappy
2. bad, sorry, homesick, nostalgic, lovesick, miserable, suffering, wretched, dejected, discontented, discontent, dysphoric, distressed, infelicitous, joyless, sad, sorrowful, cheerless, uncheerful, dysphoric
3. distressed, dejected, unpleasant
4. infelicitous
4. unfortunate