What’s a word/phrase for “a place what’s so dark you can’t see anything in it”?

Example sentence:

He didn’t know why he killed the victim. Maybe the reason was hidden
in a __ corner within himself.

I checked dark on Thesaurus, but the synonyms only refers to light, not to the fact that you can’t see.

Any suggestions?


A common idiom is pitch dark, i.e. as dark as pitch (tar). Pitch black is also used to describe the colour of something.

The Phrase Finder: pitch dark

Source : Link , Question Author : alex , Answer Author : Mick

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