The antonyms for the phrase "most formed" essentially refer to things that are unformed, deformed, disorganized or shapeless. Some of the most common antonyms of "most formed" are disordered, chaotic, misshapen, amorphous, irregular and disfigured. These words describe things that are not well-structured, evenly proportioned or symmetrical. Some other antonyms of "most formed" include formless, unarranged, disarranged, unbalanced, jumbled and unstructured. These terms are often used to describe objects or things that are incomplete, incomplete and incoherent. Overall, antonyms of "most formed" connote a sense of disorder, irregularity and lack of structure.