Superlative form of pitchy: most pitchy.(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "pitchiest" in a sentence
"The cold, grey light of earliest morning, that light which is rather the fading of night than the coming of day, filled the room with a faint hue, more cheerless than pitchiest darkness."
"The range of this portrait painter's palette is from pitchiest black to most dazzling white, as of snow smitten by sunlight."
"He makes his berth an Aladdin's lamp, and lays him down in it; so that in the pitchiest night the ship's black hull still houses an illumination."