Somber (adjective)

1. Having a serious or gloomy atmosphere or appearance.
2. Not cheerful or bright in color; dark.
3. Having a dark or dull color or appearance.

Origin:

Late middle english: from old french sombre, from latin subumbrare "be in the shade", from sub- "under" + umbrare "cast a shadow".

Examples:

1. The sky was somber and gray, portending a storm.
2. The somber mood at the funeral was palpable.
3. The somber colors of the painting created a sense of unease.
4. The somber music set the tone for the play.
5. She wore a somber black dress to the funeral.