sombre in WordNet English dictionary

1. lacking brightness or color; dull
   "drab faded curtains"; "sober Puritan grey"; "children in somber brown clothes"
   drab  sober  somber  sombre 
   
2. grave or even gloomy in character
   "solemn and mournful music"; "a suit of somber black"; "a somber mood"
   somber  sombre  melancholy