What is another word for pitch blackness?
Pronunciation: [pˈɪt͡ʃ blˈaknəs] (IPA) 
Pitch blackness is the absolute absence of light. It's a phrase widely used to describe absolute darkness, but there are several other words that can be interchangeably used to describe it. Some synonyms for pitch blackness include complete darkness, utter darkness, impenetrable darkness, and total obscurity. Other phrases used to describe pitch blackness are inky black, jet black, and coal black. It can also be called the abyss, the void, or the depths of darkness. Regardless of which phrase one prefers, each of them connote a feeling of fear, unease, and the unknown.
