Dim or somewhat gloomy; lacking sufficient light so that things are faint or shadowed (e.g., a dim room or twilight).
夜の公園は薄暗くて少し怖い。
The park at night is dim and a bit scary.
部屋の電気を消してしまい、薄暗いままだった。
I had turned off the room light and it stayed dim.
薄暗いうちに帰ると道が見えにくい。
When it's getting dim, it's hard to see the road on the way home.