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?

  • Just an opinion: I think dark is good enough if you make it flow a little better, like, Maybe the reason was hidden in the darkest corner of his mind. Commented Oct 28, 2016 at 2:30
  • Too bad we have lost the original meaning of occult, because that is a perfect fit here. Commented Oct 28, 2016 at 2:59

1 Answer 1


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

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