na-adjective, noun
pitch-dark; completely dark
Describes a place or situation with no light at all; often used literally for darkness, but can also describe a very dark color or a lack of visibility.
停電で部屋の中が真っ暗になった。
The room went pitch-dark because of the power outage.
外はもう真っ暗だ。
It's already completely dark outside.
na-adjective, noun
very bleak; utterly hopeless
Figurative use for a future, prospect, or situation that seems completely without hope or light.
このままでは将来が真っ暗だ。
At this rate, the future looks utterly hopeless.