The word "uncivilizednesses" does not have an exact antonym in English language, but there are words that can be used to convey the opposite meaning. These words include "civilization," "cultured," "sophisticated," "educated," "refined," and "enlightened." These antonyms imply that something is developed, advanced, and civilized. Therefore, the opposite of uncivilizedness is a state of being cultured, educated, sophisticated, and enlightened. These words are often used to describe advanced societies or individuals, who display a high level of knowledge, manners, and social etiquette. The concept of opposites is important in language, as it allows us to express different sides of the same idea, and to create a fuller understanding of the world around us.