Somber means dark and gravely serious in mood. A somber mood, somber colours, somber news.
This is the American spelling; British writing has sombre. It covers both the look and the feeling — somber clothes and a somber occasion — and the two usually go together. It is heavier than serious and quieter than grim.
1adjectivesomberDark and gravely serious in mood.
“The mourners stood in somber silence as the coffin was carried out.”
somber is a quality of mood.
Also accepted in games: sombre, solemn