The word "unstructured" refers to something that lacks organization or a defined structure. Synonyms for this word include disordered, chaotic, haphazard, unorganized, untidy, confused, and messy. These words indicate a lack of structure or a system in place. Another way to describe something that is unstructured is to say that it is free-form, unplanned, or without structure. Whatever the context, the use of these synonyms allows a greater degree of variation in language, and can help to express more precisely the specific lack of structure that is being referred to.