The word "transmute" means to change or transform one thing into another. As it is difficult to find a direct antonym for this term, we can explore words that convey an opposite meaning. The words "unchanged", "static", and "immutable" stand for the state of being the same and lack of transformation. On the other hand, the terms "corrupt", "degenerate", and "debase" signify something that has undergone a negative change or transformation. Similarly, "decay", "deterioration", and "dilapidation" refer to the gradual disintegration of something over time. In short, the antonyms for "transmute" can range from lack of transformation to negative transformation, depending on the context.