noun, noun which may take the genitive case particle 'no', na-adjective
complete darkness; total darkness; pitch darkness
Emphatic word for absolute darkness, stronger than 暗闇 alone. Often used in descriptions of places or situations with no light at all.
The basement was pitch dark and I couldn't see anything.
真っ暗闇の中を手探りで進んだ。
I groped my way forward in complete darkness.