Pitch-dark means so dark that nothing at all can be seen. It was pitch-dark by six.
The pitch in pitch-dark is the black tar used on ships, which is as dark as anything a sailor knew. Real pitch-dark is rare anywhere near a town, since the sky itself glows.
1adjectivepitch-darkSo dark that nothing at all can be seen.
“The lane was pitch-dark and there was no torch in the car.”
pitch-dark is a quality.
Also accepted in games: pitch dark
Practised in A Song of Ice and Fire