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Adjective: cheerless  cheer-lus
  1. Causing sad feelings of gloom and inadequacy
    "something cheerless about the room";
    - depressing, uncheerful

See also: blue, cheer, cheerfulness, dark, dingy, disconsolate, dismal, drab, drear, dreary, gloomy, grim, joyless, melancholy, somber [US], sombre [Brit, Cdn], sorry, sunniness, sunshine, unhappy