Use the adjective achromatic to describe something that's colorless, like a dull winter sky.

When something is without a color or hue, it is achromatic. Gray urban landscapes and the black surface of a lake on a starless night could both be described as achromatic. In physics, the word achromatic is a bit more complicated, meaning "able to reflect light without it separating into colors." The Greek root word is akhrōmatikos, "colorless," combining the prefix a,"without," and khrōma, "color."

Definitions of achromatic

adj having no hue

argent, silver, silverish, silvery
of lustrous grey; covered with or tinged with the color of silver
ash-gray, ash-grey, ashy
of a light grey
of something that is somewhat black
black-gray, black-grey, blackish-gray, blackish-grey
of dark grey
blue-white, bluish-white, cool-white
of white tinged with blue
blue-gray, blue-grey, bluish-gray, bluish-grey
of grey tinged with blue
blue-black, bluish black
of black tinged with blue
brown-black, brownish-black
of black tinged with brown
brown-gray, brown-grey, brownish-gray, brownish-grey
of grey tinged with brown
of greyish white
of something having the color of chalk
charcoal, charcoal-gray, charcoal-grey
of a very dark grey
coal-black, jet, jet-black, pitchy, sooty
of the blackest black; similar to the color of jet or coal
of something as white as cotton
of a dull shade of white
ebon, ebony
of a very dark black
gray, grayish, grey, greyish
of an achromatic color of any lightness intermediate between the extremes of white and black
gray-black, grayish-black, grey-black, greyish-black
of black tinged with grey
gray-white, grayish-white, grey-white, greyish-white
of white tinged with grey
greenish-gray, greenish-grey
of grey tinged with green
green-white, greenish-white
of white flowers tinged with green
of something totally lacking in saturation and therefore having no hue
ink-black, inky, inky-black
of the color of black ink
iron-gray, iron-grey
of the grey color of iron
of a pure white color
of a white the color of fresh milk
olive-gray, olive-grey
of grey tinged with olive
dark-gray, dark-grey, oxford-gray, oxford-grey
of a dark shade of grey
pearl gray, pearl grey
of a grey with a pearly tinge
pearly, pearly-white
of a white the color of pearls
of white tinged with pink
purple-black, purplish-black
of black tinged with purple
purple-white, purplish-white
of white tinged with purple
red-gray, red-grey, reddish-gray, reddish-grey
of grey tinged with red
of a dark somewhat brownish black
silver-gray, silver-grey, silvery-gray, silvery-grey
of grey resembling silver
silver-white, silvery-white
of a white that resembles silver
of a black tinged with slate-grey
slate-gray, slate-grey, slatey, slaty, slaty-gray, slaty-grey, stone-gray, stone-grey
of the color of slate or granite
snow-white, snowy
of the white color of snow
soot-black, sooty-black
of the black color of soot
of black tinged with violet
(of plants) having white flowers
off-white, whitish
of something having a color tending toward white
yellow-gray, yellow-grey, yellowish-gray, yellowish-grey
of grey tinged with yellow
yellow-white, yellowish-white
of a white tinged with yellow
colorless, colourless
weak in color; not colorful
being or having or characterized by hue
amber, brownish-yellow, yellow-brown
of a medium to dark brownish yellow color
of green tinged with amber
of a moderate purple color
(of hair) colored a moderate reddish-brown
aureate, gilded, gilt, gold, golden
having the deep slightly brownish color of gold
of the dull yellowish green of the meat of an avocado
azure, bright blue, cerulean, sky-blue
of a deep somewhat purplish blue color similar to that of a clear October sky
of a light greyish-brown color
of brown tinged with black
of red tinged with black
of bluish-black or grey-blue
blue, blueish, bluish
of the color intermediate between green and violet; having a color similar to that of a clear unclouded sky
blue-green, bluish green, cyan, teal
of a bluish shade of green
blue-lilac, bluish-lilac
of lavender tinged with blue
blue-purple, bluish-purple
of purple tinged with blue
blue-violet, bluish-violet
of violet tinted with blue
blushful, rosy
of blush color
of a dark to moderate greyish green color
bright-red, raspberry-red
of the red of fresh raspberries
bronze, bronzy
of the color of bronze
of red tinged with bronze
brown, brownish, chocolate-brown, dark-brown
of a color similar to that of wood or earth
brown-green, brownish-green
of green tinged with brown
brown-purple, brownish-purple
of dark purple tinted with brown
of the yellowish-beige color of buff leather
of brown tinged with buff
canary, canary-yellow
having the color of a canary; of a light to moderate yellow
caramel, caramel brown
having the color of caramel; of a moderate yellow-brown
pink or pinkish
of something having the yellowish green color of Chartreuse liqueur
(of hair or feathers) of a golden brown to reddish brown color
(of hair or feathers) of brown tinged with chestnut
copper colored, coppery
of something having the color of copper
of a strong pink to yellowish-pink color
of red tinged with coral
of the color of cream
yellow with a creamy tinge
cress green, cresson, watercress
of a moderate yellow-green color that is greener and deeper than moss green and yellower and darker than pea green
magenta tinged with crimson
purple tinged with crimson
yellow tinged with crimson
of a dark shade of blue
of a deep shade of pink
of something having the color of a pumpkin
of a dull shade of purple
of a dull greyish brown to brownish grey color
earth colored; of something having a color of soil or earth
fuscous, taupe
of something having a dusky brownish grey color
of yellow tinged with gold
of brown tinged with gold
of green tinged with gold
gray-blue, grayish-blue, grey-blue, greyish-blue
of blue tinged with grey
gray-brown, grayish-brown, grey-brown, greyish-brown
of brown tinged with grey
gray-green, grayish-green, grey-green, greyish-green
of green tinged with grey
gray-pink, grayish-pink, grey-pink, greyish-pink
of pink tinged with grey
dark-green, green, greenish, light-green
of the color between blue and yellow in the color spectrum; similar to the color of fresh grass
of brown tinged with green
of a light brown or yellowish brown color
of brown tinged with hazel
of something having the color of honey
jade, jade-green
of something having the color of jade; especially varying from bluish green to yellowish green
of a yellowish brown color
lavender, lilac, lilac-colored
of a pale purple color
of something tinged with lavender
light-blue, pale blue
of a light shade of blue
lilac-blue, violet-blue
of blue tinged with lavender
lavender-pink, lilac-pink, violet-pink
of pink tinged with lavender
of purple tinged with lilac
of deep purplish red
magenta pink
of pink tinged with magenta
brownish-red, maroon
of dark brownish to purplish red
of purple tinged with maroon
of a pale to moderate greyish violet color
of blue tinged with mauve
of pink tinged with mauve
moss green, mosstone
of a moderate somewhat dull yellow-green color
mouse-colored, mouselike, mousey, mousy
of something having a drab pale brown color resembling a mouse
ocher, ochre
of a moderate orange-yellow color
of a brown color with a greenish tinge
drab, olive-drab
of a light brownish green color
of a yellow-green color similar to that of an unripe olive
orange, orangish
of the color between red and yellow; similar to the color of a ripe orange
orange-red, orangish-red
of red tinged with orange
of brown tinged with orange
peachy, peachy-colored, peachy-coloured
of something resembling a peach in color
of bright greenish blue
of a moderate slightly yellowish-green color
pink, pinkish
of a light shade of red
pink-lavender, pinkish-lavender
of lavender tinged with pink
pink-orange, pinkish-orange, salmon
of orange tinged with pink
of red tinged with pink
of a color tinged with pink
pink-purple, pinkish-purple
of purple tinged with pink
powder blue, powdery-blue
of a moderate to pale blue or purplish blue
purple, purplish, violet
of a color intermediate between red and blue
purple-blue, purplish-blue
of blue tinged with purple
purple-brown, purplish-brown
of brown tinged with purple
purple-green, purplish-green
of green tinged with purple
purple-lilac, purplish-lilac
of lavender tinged with purple
purple-red, purplish-red
of red tinged with purple
purple-tinged, purple-tinted
of a color tinged with purple
blood-red, carmine, cerise, cherry, cherry-red, crimson, red, reddish, ruby, ruby-red, ruddy, scarlet
of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies
mahogany-red, red-brown, reddish-brown
of brown tinged with red
red-lavender, reddish-lavender
of something having a lavender color tinged with red
of a pink color that is close to red
flame-orange, red-orange, reddish-orange
of orange tinged with red
red-purple, reddisn-purple
of purple tinged with red
red-violet, reddish-violet
of violet tinged with red
rosaceous, rose, roseate
of something having a dusty purplish pink color
of a deep slightly bluish red color
rose-lavender, rose-lilac
of lavender tinged with rose
of mauve tinged with rose
rose-purple, rosy-purple
of purple with a rose tinge
rose-tinged, rose-tinted
of a color tinged with rose
of brown with a reddish tinge
rust, rust-brown, rusty
of the brown color of rust
rust-red, rusty-red
of a red color tinged with rust
of something having the brown color of rust
sage, sage-green
of the grey-green color of sage leaves
of something having the color of a blue sapphire
of crimson tinged with scarlet
of pink tinged with scarlet
of the color of the sea; bluish green
silver-blue, silvery-blue
of something having a color that is a light shiny blue
silver-green, silvery-green
of something having a color that is a light shiny green
chukker-brown, mummy-brown, snuff, snuff-brown
snuff colored; of a greyish to yellowish brown
brownish-orange, sorrel
of a light brownish color
of any of various dull tannish or grey colors
of a pale yellow color like straw; straw-colored
sulfur-yellow, sulphur-yellow
of something having the yellow color of sulfur
of a light yellowish-brown color
of a color resembling tan
of a strong reddish orange color
tawny, tawny-brown
of a light brown to brownish orange color; the color of tanned leather
of a brilliant pure blue to purplish blue color
of the color of any of various natural brown earth pigments
Chinese-red, cinnabar, vermilion, vermillion
of a vivid red to reddish-orange color
of the color of wine
violet-tinged, violet-tinted
of something that is tinged with violet
of pink tinged with white; a light tint of pink
of something having the dark red color of red wine
xanthous, yellow, yellowish
of the color intermediate between green and orange in the color spectrum; of something resembling the color of an egg yolk
yellow-beige, yellowish-beige
of beige tinged with yellow;
of a color midway between yellow and green
yellow-orange, yellowish-orange
of orange tinged with yellow
of a color tinged with yellow
colored, colorful, coloured
having color or a certain color; sometimes used in combination
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