greyness(n = noun.attribute) gray, grayness, grey - a neutral achromatic color midway between white and black;
is a kind of achromatic color, achromatic colour
has particulars: ash gray, ash grey, silver, silver gray, silver grey, charcoal, charcoal gray, charcoal grey, oxford gray, oxford grey, dapple-gray, dapple-grey, dappled-gray, dappled-grey, iron-gray, iron-grey, tattletale gray, tattletale grey, davy's gray, davy's grey, iron blue, steel gray, steel grey
Derived form adjective grey₁

   a neutral achromatic color midway between while and black. [WordNet 1.5]