Similar word to pitchblack:

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, opaque, overcast, pitch-black, pitch-dark, pitchy, rayless, shaded, shadowy, shady, somber, sooty, stygian, sunless, tenebrous, unlighted, unlit, vague