Depressing
bleak
gloomy, dark
This rainy weather has made everything so dark, depressing and gloomy.
Stygian.
lowering
The chambers of the castle were dark and gloomy. Just because our team lost, there is no need to be gloomy and dejected.
The likely word is "gloomy" (dark, or dismal).
Misery
The word is Stygian.
dark,cold
gloomy
dark, raven, ebony, shadowy, gloomy