cheerless
colorless
colourless
depressing
sombre
uncheerful
Acheronian
Acherontic
Cimmerian
Quaker-colored
Stygian
acier
apocalyptic
ashen
ashy
bad
baleful
baneful
black
blackish
bleak
bodeful
boding
caliginous
canescent
cinereous
cinerous
clouded
cloudy
creamy
dapple
dapple-gray
dappled
dappled-gray
dark
dark and gloomy
dark-colored
darkish
darksome
dead
deadened
decorous
delicate
demure
depressed
depressive
dim
dingy
dire
dismal
dispiriting
doomful
dove-colored
austere
dejected
depress
dour
funereal
gloomy
haggard
majestic
mournful
murky
ominous
pensive
shadowy
sober
sullen