darken
to make or become less bright; to make darker
She closed the blinds to darken the room.
darkener
a substance or device that makes something darker
The technician applied a darkener to the photo to increase contrast.
darker
more dark; having less light or a deeper shade
The clouds made the afternoon much darker than usual.
darkest
most dark; having the least light or the deepest shade
They reached the darkest part of the cave by midnight.
darkness
the state of having little or no light; gloom
The power outage plunged the whole neighborhood into darkness.
darkly
in a dark manner; gloomily or obscurely
He smiled darkly and refused to answer the question.
darkish
somewhat dark; slightly dark in color or tone
She chose a darkish green paint for the study.
darkroom
a lightproof room for developing photographic film
He spent the afternoon developing prints in the darkroom.
darkling
in or into darkness; dim, mysterious (poetic)
A darkling hush fell over the valley as night came on.
dark-haired
having dark-colored hair
The dark-haired child waved at us from the window.