Definitions from Wiktionary ( )

▸ adjective:  Having an absolute or (more often) relative lack of light.
▸ adjective:  (of a source of light) Extinguished.
▸ adjective:  Deprived of sight; blind.
▸ adjective:  Transmitting, reflecting, or receiving inadequate light to render timely discernment or comprehension: caliginous, darkling, dim, gloomy, lightless, sombre.
▸ adjective:  (of colour) Dull or deeper in hue; not bright or light.
▸ adjective:  Ambiguously or unclearly expressed: enigmatic, esoteric, mysterious, obscure, undefined.
▸ adjective:  Marked by or conducted with secrecy: hidden, secret; clandestine, surreptitious.
▸ adjective:  (gambling, of race horses) Having racing capability not widely known.
▸ adjective:  Without moral or spiritual light; sinister, malevolent, malign.
▸ adjective:  Conducive to hopelessness; depressing or bleak.
▸ adjective:  (of a time period) Lacking progress in science or the arts.
▸ adjective:  Extremely sad, depressing, or somber, typically due to, or marked by, a tragic or undesirable event.
▸ adjective:  With emphasis placed on the unpleasant and macabre aspects of life; said of a work of fiction, a work of nonfiction presented in narrative form, or a portion of either.
▸ adjective:  (broadcasting, of a television station) Off the air; not transmitting.
▸ noun:  A complete or (more often) partial absence of light.
▸ noun:  (uncountable) Ignorance.
▸ noun:  (uncountable) Nightfall.
▸ noun:  A dark shade or dark passage in a painting, engraving, etc.
▸ verb:  (intransitive) To grow or become dark, darken.
▸ verb:  (intransitive) To remain in the dark, lurk, lie hidden or concealed.
▸ verb:  (transitive) To make dark, darken; to obscure.
▸ noun:  A surname.

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