Un-formed is a word used to describe something that lacks shape or structure, but what are some antonyms to describe the opposite? Well, formed, shaped, structured, and organized are all great antonyms to the word un-formed. Formed implies that something has taken on a particular shape or structure, while shaped would describe something that has been molded or created in a certain way. Structured suggests that something has been arranged in a deliberate and orderly manner, while organized would imply that something has been systematized and structured in a logical way. Using these antonyms can help you more accurately communicate and describe something that has taken on a particular shape or structure.