"Most spattered" refers to something that is covered in a lot of splatters, stains, or marks. To describe the opposite of this, we can use words such as clean, unblemished, spotless, immaculate, pristine, and polished. These words indicate a surface that is free from any marks, stains, or blemishes. For example, a freshly laundered white shirt can be described as spotless or immaculate, whereas a shirt that has been worn and stained with food or ink can be described as most spattered. Therefore, by using antonyms of "most spattered," we can paint a picture of an entirely different and cleaner surface, without any messy splatters or stains.