Most unmixed is a term that is used to describe something that is very clear, pure, or undiluted. It can be difficult to come up with antonyms for this term as it represents a very specific idea. However, some antonyms could include: mixed, impure, diluted, confused, or unclear. These terms represent the opposite of something that is most unmixed. For example, if you were to describe a drink as most unmixed, it would mean that there are no other flavors or ingredients added to it. In contrast, if you were to describe a drink as mixed, it would mean that there are several flavors or ingredients blended together.