The word "unpainted" means not having any paint or color applied to it. It refers to something that is in its natural state, without any decoration or enhancement through painting.
The rawness of the resulting colour fields, along with the large areas of unpainted canvas, gives many of his paintings a provisional feeling, emphasising his convictions about the independent life of the materials. (apollo-magazine.com)
Here, oil paint takes on the characteristics of ink and Zao even exploits a technique of Chinese calligraphy known as «flying white» (feibai), in which the hairs of the brush separate and leave unpainted areas of the surface visible. (asiasociety.org)
Large windows in unpainted wood finish help make the space feel more open and provide dramatic views. (hgtv.com)