lightless
Completely devoid of brightness
Lightless means without light—completely dark.
A lightless room has no illumination; a lightless sky shows neither sun nor stars.
The word often emphasizes total absence rather than mere dimness: lightless depths of the ocean, lightless corridors of the abandoned building.
It can describe things incapable of producing light or places where light cannot reach.
Completely without light
- voidWithout legal effect
- abyssImmeasurably profound depth
- blacknessComplete absence of light
- gloomPervasive dimness or dejection
murk · shadow · midnight · ink · coal · obsidian · opaque · umbra
Extremely deep, unmeasurable
- fathomlessImmeasurably deep or obscure
- benthicOf the sea bottom
- trenchLong narrow excavation
- submarineUnderwater naval craft
sunken · oceanic · aphotic · anoxic · bioluminescent · deep-sea · undersea · subterranean
pitch-black
Completely without light
gloom · murk · shadow · midnight · ink · coal · obsidian · opaque · umbra · tenebrous
abyssal
Extremely deep, unmeasurable
- fathomlessImmeasurably deep or obscure
- benthicOf the sea bottom
- trenchLong narrow excavation
submarine · sunken · oceanic · aphotic · anoxic · bioluminescent · deep-sea · undersea · subterranean · cave
hidden
Kept out of sight
cloaked · masked · invisible · unseen · eclipsed · occluded · blocked · shuttered · curtained · covered
bleak
Dreary and without cheer
forlorn · dreary · dismal · somber · cheerless · joyless · despairing · benighted · uninspired · soulless
- Darknessblackness, pitch black, pitch-black, inkiness, murk
- deep oceanChallenger Deep, Mariana Trench, ocean trench, trench, ocean floor
- sombergloomy, bleak, dreary, dismal, melancholy