black,blacker,blackest
cloudy,cloudier,cloudiest
dark,darker,darkest
darkened,more darkened,most darkened
dim,dimer,dimest
dingy,dingier,dingiest
drab,draber,drabest
dull,duller,dullest
foggy,foggier,foggiest
gloomy,gloomier,gloomiest
misty,mistier,mistiest
murky,murkier,murkiest
overcast,more overcast,most overcast
shadowy,more shadowy,most shadowy
somber,somberer,somberest