sombreadjective
UK US somber uk/ˈsɒm.bər/us/ˈsɑːm.bɚ/serious, sad, and without humour or entertainment:
a sombre atmosphere/voice/face
 The funeral was a sombre occasion.
 I left them in a sombre mood.
dark and plain:
He wore a sombre black suit.
Thesaurus: synonyms and related words
Lacking humour
- be no laughing matter idiom
 - beyond
 - beyond a joke idiom
 - earnest
 - humourless
 - laugh
 - lightly
 - mirthless
 - po-faced
 - poker-faced
 - rofl
 - serious
 - seriously
 - sober
 - solemnity
 - starchily
 - starchy
 - take a joke idiom
 - turgid
 
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You can also find related words, phrases, and synonyms in the topics:
Colourless or causing colour to fade
Black, white & grey
The qualities of colour
sombrely 
adverb UK US somberly uk/ˈsɒm.bə.li//ˈsɑːm.bɚ.li/
 sombreness 
noun [ U ] UK US somberness uk/ˈsɒm.bə.nəs/us/ˈsɑːm.bɚ.nəs/