Uncombining refers to the state of not being able to mix or combine two or more things together. Some synonyms for uncombining include disuniting, segregating, dividing, and isolating. Disuniting refers to the process of separating or breaking up a larger group into smaller factions or components. Segregating, on the other hand, means to separate or divide things based on certain criteria such as race or gender. Dividing refers to the process of separating something into smaller parts or sections. Isolating, on the other hand, implies completely separating or cutting off something or someone from the rest of the group.