darkness

Definition:

The term "darkness" literally means an absence of light. There are also several figurative meanings of this term:

As a metaphor, "darkness" means "impurity" or "evil" or "spiritual blindness."
It also refers to anything related to sin and moral corruption.
The expression "dominion of darkness" refers to all that is evil and ruled by Satan.
The term "darkness" can also be used as a metaphor for death. (See: Metaphor)
People who do not know God are said to be "living in darkness," which means they do not understand or practice righteousness.
God is light (righteousness) and the darkness (evil) cannot overcome that light.
The place of punishment for those who reject God is sometimes referred to as "outer darkness."

It is best to translate this term literally, with a word in the project language that refers to the absence of light. This could also be a term that refers to the darkness of a room with no light or to the time of day when there is no light.
For the figurative uses, it is also important to keep the image of darkness in contrast to light, as a way to describe evil and deception in contrast to goodness and truth.
Depending on the context, other ways to translate this could be, "darkness of night" (as opposed to "light of day") or "not seeing anything, like at night" or "evil, like a dark place".