The term "assumed form of" suggests that something has taken on a particular appearance or characteristic that may not necessarily be its true nature. Antonyms for this phrase might include "genuine form of," "authentic version of," and "actual manifestation of." These indicate a more truthful representation of something, rather than something that has been altered or disguised. Other antonyms might include "transparent form of," which would suggest something that is clear and easily understood, or "unmodified form of," indicating that something has not been altered in any way. By using antonyms that emphasize truthfulness and transparency, you can convey a greater sense of honesty and clarity in your communication.