The word "un-compounded" refers to something that is not combined or mixed with anything else. Antonyms for this word would include terms that represent ideas of amalgamation, combination, and intermixture. Some of the antonyms for "un-compounded" include complex, compound, amalgamated, and blended. These words suggest that something is interconnected or interwoven with another element or factor. Other antonyms for "un-compounded" could be multifaceted, multifarious, heterogeneous, intricate, or composite. These words embody the concept of something that is composed of many parts or elements, and reflects a myriad of diverse characteristics or features.