It's terribly dark around at night, and so on. Fill in the blanks. According to relevant information: fill in the blanks: horribly black, completely black, horribly black, horribly black, horribly black, terribly dark, horribly black, horribly black, etc. It's dark, which means the light is dim and can't be seen clearly: the troops are moving fast in the dark night. It's dark: it's dark outside at night and you can't see anything. It's dark: it's dark in the cave.