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I've been trying to find it on Google for an hour now, with no luck.
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You'll have better luck with Woodhouse, though Woodhouse is best used like Wikipedia, a useful starting point that must be verified. Always check Woodhouse against LSJ vel sim.
If you're looking for a noun, ὁ σκότος (classical, also τὸ σκότος, τοῦ σκότους) or ἡ σκοτία (more frequent in, though not exclusive to, the New Testament).
ζόφος is also a noun meaning darkness with a sense of gloom. I assume you want specifically an adjective. σκοτεινός is a common adjective derived from the word u/redundet_oratio mentioned. αὐχμηρός is another word for dark. ἔννυχος is an adverb meaning "at night" if that helps.
All my knowledge pertains to Biblical Greek. There are surely other words in the Greek corpus.
μέλας (me/las), from which melanin ("darkness" pigment) and the names Melanie and Melania come.
http://wordinfo.info/unit/1917
In addition to what the others have said, there is also: ἔρεβος.