The Collaborative International Dictionary of English v.0.48:

Gloomy \Gloom"y\, a. [Compar. Gloomier; superl. Gloomiest.]
   1. Imperfectly illuminated; dismal through obscurity or
      darkness; dusky; dim; clouded; as, the cavern was gloomy.
      "Though hid in gloomiest shade." --Milton.
      [1913 Webster]

   2. Affected with, or expressing, gloom; melancholy; dejected;
      as, a gloomy temper or countenance.

   Syn: Dark; dim; dusky; dismal; cloudy; moody; sullen; morose;
        melancholy; sad; downcast; depressed; dejected;
        disheartened.
        [1913 Webster]