Pitch-dark and Pitch dark

Pitch-dark adjective - Being without light or without much light.

Pitch dark and pitch-dark are semantically related In some cases you can use "Pitch dark" instead an adjective phrase "Pitch-dark".

Pitch-dark and pitch dark are semantically related in black topic. You can use "Pitch-dark" instead an adjective phrase "Pitch dark", if it concerns topics such as dark, lack of light, very dark in color.