WordWeb Online

1. Depressingly dark
   "the gloomy forest";
   - glooming [archaic], gloomful [archaic], sulky
    
2. Filled with melancholy and despondency
   "gloomy at the thought of what he had to face"; "gloomy predictions"; "a gloomy silence";
   - grim, blue [informal], depressed, dispirited, down, downcast, downhearted, down in the mouth, low, low-spirited
    
3. Causing dejection
   "a dark gloomy day";
   - blue [informal], dark, dingy, disconsolate, dismal, grim, sorry, drab, drear, dreary

Derived forms: gloomier, gloomiest

See also: cheerless, dark, dejected, depressing, uncheerful

Encyclopedia: Gloomy