Same word as dark:

Cimmerian, aphotic, atramentous,black, blackish, caliginous, clouded,cloudy, crepuscular, darkened,dim,dingy,drab,dull, dun,dusk, dusky,faint, foggy,gloomy, grimy, ill-lighted,indistinct, inky, lightless,lurid, misty,murky,nebulous, obfuscous,obscure,opaq