1. Dark and gloomy: Lacking light or brightness and producing a dull, dark, or melancholy atmosphere.
2. Dark in color: Having a color or tone that is dark, dull, or suitable for a serious mood or occasion.
3. Serious and melancholy: Marked by or conveying strict seriousness combined with sadness or a troubled state of mind.
NOTE: Sombre is the American version of the word 'Somber'. Somber is Canadian and UK spelling.
A sombre song, depressing and without variety.