The word "unmilled" refers to grains or other agricultural products that have not undergone the process of milling, which involves grinding and crushing them into a finer consistency. The antonyms for "unmilled" would be terms that describe grains or other products which have undergone the milling process. Some antonyms for "unmilled" include "milled", "refined", "polished", "flourished", "grained", and "ground". These words indicate that the grains or products have been processed, resulting in a more uniform texture and consistent quality. Milled grains are typically used in a wide variety of culinary applications, including baking, cooking, and the production of various foodstuffs.