Buồn nản, chán nản, chán ngán, thất vọng

adjective

abject , all torn up , atrabilious , black , bleak , broody , bummed out , cast down , cheerless , clouded , crestfallen , dampened , dashed , despondent , disconsolate , discouraged , disheartened , dismal , dispirited , doleful , down , downcast , downhearted , down in the dumps , down in the mouth * , dragged , drooping , droopy , gloomy , glum , heavyhearted , hurting , in the pits , low , low-spirited , melancholy , miserable , moody , mopey , mopish , morose , sad , sagging , shot down , spiritless , woebegone , wretched , blue , desolate , dull , dysphoric , heavy-hearted , melancholic , tristful , unhappy , wistful , chapfallen , depressed , humbled , inconsolable , saddened , somber , sorrowful

adjective

cheerful , encouraged , happy , joyous