(uncountable) The state of being dark; lack of light; the absolute or comparative absence of light.

(uncountable) The state or quality of reflecting little light, of tending to a blackish or brownish color.

(uncountable, countable) Any space that such colour pervades.

(uncountable) Gloom; gloominess; depression.

(countable) The product of being dark.

(uncountable) Lack of understanding or compassion; spiritual or mental blindness.

(uncountable) Secrecy; concealment.

(uncountable) Lack of knowledge; obscurity or meaning or intelligibility; the unknown.

(uncountable) Hell.