Which term is used to describe sake that is unfiltered and not charcoal filtered after brewing?

The term used to describe sake that is unfiltered and has not undergone charcoal filtration after brewing is "Muroka." Muroka sake retains the natural flavors and aromas of the rice and the fermentation process, providing a richer and more robust profile compared to filtered sake.

In the brewing process, many sake types undergo a filtration that can strip away some of the delicate flavors, while muroka allows for a more authentic expression of the sake’s underlying characteristics. This style can often have more visible particulates and cloudiness, as it contains elements like yeast and rice solids that would otherwise be removed in the filtration process.

Other terms in the question relate to different aspects of sake production. Nakadori typically refers to the middle portion of the sake that is extracted during pressing, which is considered to be of the highest quality. Moromi is the mash of fermenting rice, yeast, and water before it is pressed to separate the liquid sake. Nada is a region in Japan known for sake production, particularly noted for its particular style of brewing, but it does not specifically refer to the filtering process. Understanding these definitions helps to clarify the unique characteristics of muroka sake compared to filtered varieties.