From WordNet (r) 2.0 (August 2003) [wn]:
gloomy
adj 1: characterized by hopelessness; filled with gloom; "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" [syn: grim,
darkening]
2: depressing in character or appearance; "drove through dingy
streets"; "the dismal prison twilight"- Charles Dickens;
"drab old buildings"; "a dreary mining town"; "gloomy
tenements"; "sorry routine that follows on the heels of
death"- B.A.Williams [syn: dingy, dismal, drab,
drear, dreary, sorry]
3: depressingly dark; "the gloomy forest"; "the glooming
interior of an old inn"; "`gloomful' is archaic" [syn:
glooming, gloomful]
4: causing or suggestive of sorrow or gloom; "a gloomy
outlook"; "gloomy news" [syn: depressing, depressive,
saddening]
5: reflecting gloom; "gloomy faces" [syn: glum, long-faced]
6: 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" [syn:
blue, dark, depressing, disconsolate, dismal,
dispiriting, grim]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
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]