Wiktionary
grainless
a. 1 Without grain. 2 Free from grainy texture or appearance.
Usage examples of "grainless".
The colours were bright and crude, the features boldly made and easily recognisable, all done in the same smooth, light substance like papier-machè or a kind of grainless wood.
Her hands on the display controller in her lap could've been carved from a grainless wood.
The wean was white-skinned as Claire, but with the sickly blue-white cast of skimmed milk, not Claire's pale glow, rich and grainless as the silk-white heartwood of a poplar tree.