colorless

adj. pale; lacking color; dull, boring (also colourless)

Color or colour (see spelling differences) is the visual perceptual property corresponding in humans to the categories called red, yellow, blue, black, etc. Color derives from the spectrum of light (distribution of light energy versus wavelength) interacting in the eye with the spectral sensitivities of the light receptors. Color categories and physical specifications of color are also associated with objects, materials, light sources, etc., based on their physical properties such as light absorption, reflection, or emission spectra.
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Adjective
1. lacking in variety and interest; "a colorless and unimaginative person"; "a colorless description of the parade"
(synonym) colourless
(antonym) colorful
(similar) neutral
(see-also) dull
2. weak in color; not colorful
(synonym) colourless
(antonym) colorful, colourful
(similar) ashen, blanched, bloodless, livid, white
(see-also) achromatic
(attribute) color, colour, vividness

(a.)
Without color; not distinguished by any hue; transparent; as, colorless water.
  

(a.)
Free from any manifestation of partial or peculiar sentiment or feeling; not disclosing likes, dislikes, prejudice, etc.; as, colorless music; a colorless style; definitions should be colorless.
  

Synonyms and related words:
abstract, achromatic, achromic, aloof, anemic, arid, ashen, ashy, barren, blah, blanched, bland, blank, bled white, bloodless, blurry, boring, cadaverous, characterless, chloranemic, cold, dead, deadly pale, deathly pale, detached, dim, dimmed, dingy, discolored, disinterested, dismal, dispassionate, doughy, drab, draggy, drearisome, dreary, dry, dryasdust, dull, dusty, effete, elephantine, empty, etiolated, exsanguinated, exsanguine, exsanguineous, fade, faded, faint, fallow, feeble, flat, ghastly, gray, haggard, hazy, heavy, ho-hum, hollow, hueless, hypochromic, impersonal, inane, inexcitable, insipid, jejune, lackluster, leaden, lifeless, livid, low-spirited, lurid, lusterless, mat, mealy, milk-and-water, muddy, namby-pamby, neutral, obscure, pale, pale as death, pale-faced, pallid, pasty, pedestrian, plodding, pointless, poker-faced, poky, ponderous, prosaic, prosy, remote, sallow, sickly, slow, solemn, spiritless, sterile, stiff, stodgy, stuffy, superficial, tallow-faced, tasteless, tedious, toneless, uncolored, unimaginative, uninspired, uninteresting, unlively, vacuous, vague, vapid, wan, washed out, washed-out, waxen, weak, whey-faced, white, wishy-washy, withdrawn, wooden,