pitch dark
With the whole city in pitch darkness, no one knew what was happening.
They spent most nights trudging up mountains in pitch darkness.
I should have been in pitch darkness, were it not that through the topmost leaves there twinkled, here and there, a glimmer of moonshine.
The rescue vessel was the Alaskan Rose, which had been sailing just seven miles away when catastrophe struck its sister boat in the rolling pitch-blackness of the open ocean.
SMART Vocabulary: related words and phrases Darkness & becoming dark
blackness
darken
darkened
darkness
dim
dimly
dimness
dingily
dingy
inky
pitchy
plunge someone/something into darkness
semi-darkness
shade
shaded
shadily
shadow
silhouette
silhouetted
twilight
You can also find related words, phrases, and synonyms in the topics:
Black, white & grey