A complete or (more often) partial absence of light.
Ignorance.
Nightfall.
A dark shade or dark passage in a painting, engraving, etc.
To grow or become dark, darken.
To remain in the dark, lurk, lie hidden or concealed.
To make dark, darken; to obscure.
Having an absolute or (more often) relative lack of light.
(of colour) Dull or deeper in hue; not bright or light.
Hidden, secret, obscure.
Without moral or spiritual light; sinister, malign.
Conducive to hopelessness; depressing or bleak.
Lacking progress in science or the arts; said of a time period.
With emphasis placed on the unpleasant aspects of life; said of a work of fiction, a work of nonfiction presented in narrative form or a portion of either.