"color," Old English hiw "color; form, appearance; species, kind; beauty," earlier heow, hiow, from Proto-Germanic *hiwam (source also of Old Norse hy "bird's down," Swedish hy "skin, complexion," Gothic hiwi "form, appearance"), from PIE *kiwo-, suffixed form of root *kei- (2), a color adjective of broad application (source also of Sanskrit chawi "hide, skin, complexion, color, beauty, splendor," Lithuanian šyvas "white").
A common word in Old English, squeezed into obscurity after c. 1600 by color (n.) but revived 1850s in chemistry and chromatography, often in a distinctive sense in reference to the quality of color other than luminosity and chroma.
word-forming element meaning "lacking, cannot be, does not," from Old English -leas, from leas "free (from), devoid (of), false, feigned," from Proto-Germanic *lausaz (cognates: Dutch -loos, German -los "-less," Old Norse lauss "loose, free, vacant, dissolute," Middle Dutch los, German los "loose, free," Gothic laus "empty, vain"), from PIE root *leu- "to loosen, divide, cut apart." Related to loose and lease.
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Definitions of hueless from WordNet
of something totally lacking in saturation and therefore having no hue;