When it comes to antonyms for the phrase "am composed of," there are several options. The most straightforward antonym would be "am not composed of," meaning that the subject in question does not consist of any parts or elements. Other possible antonyms might include "am broken apart," "am fragmented," or "am dissolved," which suggest that the subject is no longer a cohesive whole. Additionally, antonyms could take the form of contrasting phrases or ideas, such as "am diversified," "am complex," or "am multifaceted," indicating that the subject is made up of various diverse components rather than a simple, unified entity.