What are the opposite words for form?

The word "form" implies a visible or perceptible shape or structure. Some antonyms for "form" include informality, disorder, and chaos. Informality refers to the absence of fixed rules or conventions, and hence an absence of any specific form. Disorganization juxtaposes with formality by implying a lack of order or structure. Similarly, chaos pertains to a state of complete disorder or confusion, where nothing follows any specific form or pattern. Other antonyms for "form" could be informlessness, unsystematic, or irregularity, depending on the context in which the word is being used.