Definition of "Dark" :
noun: an unenlightened state
"He was in the dark concerning their intentions."
noun: an unilluminated area
"He moved off into the darkness."
noun: absence of light or illumination
noun: absence of moral or spiritual values
"The powers of darkness."
noun: the time after sunset and before sunrise while it is dark outside
adjective: not giving performances; closed
"The theater is dark on Mondays."
adjective: brunet (used of hair or skin or eyes)
adjective: devoid of or deficient in light or brightness; shadowed or black
"Sitting in a dark corner."
adjective: causing dejection
"The dark days of the war."
adjective: (used of color) having a dark hue
adjective: marked by difficulty of style or expression
"Much that was dark is now quite clear to me."
adjective: lacking enlightenment or knowledge or culture
"The dark ages."
adjective: stemming from evil characteristics or forces; wicked or dishonorable
"Darth Vader of the dark side."
adjective: showing a brooding ill humor
"A dark scowl."
"Keep it dark."