1) Austere 2) Cheerless 3) Doleful 4) Drab 5) Grave 6) Grim 7) Sad 8) Solemn 9) Sombre 10) Staid 11) Stern 12) Uncheerful 1) Cheerless 2) Dark and gloomy 3) Gloomily dark 4) Gloomy 5) Glum 6) Grave 7) Like many works in minor keys 8) Melancholy 9) Not at all sunny 10) Serious 11) Shadowy 12) Sombre 13) Uncheerful 14) Unsmiling 15) Very serious 
• (v. t.) Alt. of Sombre • (n.) Alt. of Sombre • (a.) Alt. of Sombre
[adj] - grave or even gloomy in character
somber, sombre (British), sombrous 1. Lacking light or brightness and producing a dull, dark, or melancholy atmosphere. 2. Having a color or tone that is dark, dull, or suitable for a serious mood or occasion. 3. Marked by or conveying strict seriousness combined with sadness or a troubled state of mind. Via French, 'gloomy', ultimately from la......
sombre adjective grave or even gloomy in character; `solemn and mournful music`; `a suit of somber black`; `a somber mood`
[Novel words] grave or even gloomy in character[Lexical terms] grave or even gloomy in character