gloomy in WordNet English dictionary

1. filled with melancholy and despondency
   "gloomy at the thought of what he had to face"; "gloomy predictions"; "a gloomy silence"; "took a grim view of the economy"; "the darkening mood"; "lonely and blue in a strange city"; "depressed by the loss of his job"; "a dispirited and resigned expression on her face"; "downcast after his defeat"; "feeling discouraged and downhearted"
   gloomy  grim  blue  depressed  dispirited  down  downcast  downhearted  down in the mouth  low  low-spirited 
   
2. causing dejection
   "a blue day"; "the dark days of the war"; "a week of rainy depressing weather"; "a disconsolate winter landscape"; "the first dismal dispiriting days of November"; "a dark gloomy day"; "grim rainy weather"
   blue  dark  dingy  disconsolate  dismal  gloomy  grim  sorry  drab  drear  dreary 
   
3. depressingly dark
   "the gloomy forest"; "the glooming interior of an old inn"; "`gloomful' is archaic"
   glooming  gloomy  gloomful  sulky