pitch
I fumbled for the light switch in the pitch dark.

gathering
We could just make out some figures in the gathering dark.

after dark
The girls weren't allowed out after dark.

before dark
We'd better try and finish this job before dark.

in the dark
I hate getting up in the dark.

afraid of the dark
Many small children are afraid of the dark.

be, look, seem
become, get, go, grow, turn
It gets dark at about six o'clock.
Suddenly the whole sky went dark.
As it grew dark, they gathered around the fire.

remain, stay

extremely, fairly, very, etc.
completely
a little, slightly, etc.
almost, nearly
It's only three o'clock and it's nearly dark already.

already
still

Dark is used with these nouns:
alley, attic, background, basement, beer, blonde, brow, brown, bruise, cave, cellar, chamber, chestnut, chocolate, cloak, cloud, coffee, colour, colouring, comedy, complexion, confines, corner, corridor, crimson, curl, day, deed, depth, earth, emotion, evening, eye, eyebrow, eyelash, face, figure, foliage, force, foreboding, forest, freckle, gaze, glasses, gleam, grey, hair, hall, hallway, head, heart, hill, hint, hollow, humour, ink, interior, look, make-up, man, matter, meat, mood, mystery, night, overcoat, passage, patch, period, pit, pool, purple, recess, red, ring, road, room, satire, scowl, secret, sense of humour, shade, shading, shadow, shape, side, silhouette, skin, sky, stain, stranger, streak, street, stripe, sunglasses, suspicion, tale, tan, thought, tint, tone, tunnel, undertone, underworld, void, window, winter, wood