Answer: somber

AnswerCrossword Clue
SOMBERShadowy
somberto make dismal (gloomy (dismally dark)) / gloomy (dismally dark)
sombervery serious
sombergloomy; dark
SOMBERLike the mood in a losing locker room
SOMBERLike many minor-key compositions
SOMBERHardly upbeat
SOMBERVery serious
SOMBERLike many works in minor keys
SOMBERDirgelike
SOMBERLike a requiem
SOMBERNot at all sunny
SOMBERUnsmiling
SOMBERDead serious
SOMBERSerious
SOMBERMelancholy.
SOMBERGloomy.
SOMBERDark and dull.
SOMBERDark and gloomy
SOMBERExtremely serious
SOMBERMournful
SOMBERQuite serious
SOMBERDark and dull
SOMBERMelancholy
SOMBERGloomy
SOMBERGrave