Aphotic and Stygian

Aphotic adjective - Lacking light; especially not reached by sunlight.

Stygian and aphotic are semantically related in lack of light topic. In some cases you can use "Stygian" instead an adjective "Aphotic".

Stygian adjective - Being without light or without much light.

Aphotic and stygian are semantically related in lack of light topic. Sometimes you can use "Aphotic" instead an adjective "Stygian".