somber
[adjective]
Synonyms: dark, caliginous, dim, dusk, dusky, gloomy, lightless, murky, obscure, tenebrous, black, bleak, depressing, depressive, dismal, dispiriting, dreary, funereal, tenebrific, serious, earnest, grave, no-nonsense, sedate, sober, sobersided, solemn, staid, weighty

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Related Idioms: as somber as an undertaker

[TahlilGaran] English Synonym Dictionary ▲

som‧bre British English, somber American English /ˈsɒmbə $ ˈsɑːmbər/ adjective
[Date: 1700-1800; Language: French; Origin: sombre, probably from Latin sub 'under' + umbra 'shade, shadow']

1. sad and serious Synonym : grave:
They sat in sombre silence.
We were all in a somber mood that night.
a sombre expression
on the sombre occasion of his mother’s funeral

2. dark and without any bright colours:
a sombre grey suit
—sombrely adverb
—sombreness noun [uncountable]

[TahlilGaran] Dictionary of Contemporary English ▲