dull Synonyms - page 7
mitigate
monochromatic
monochrome
monotone
monotonous
mousy
matte
matt
lessen
lethargic
lightless
listless
logy
lumpish
lusterless
lustreless
mat
muddy
muffle
mundane
ordinary
overcast
pale
pall
palliate
pallid
paralyse
passe
passionless
opaque
obtund
murky
musty
mute
muzzy
narcotize
nebulous
nondescript
numbing
oafish
pastel
languorous
etiolate
glassy
gloomy
grayish
grey
grimy
gross
hackneyed