Adjective unstructured has 2 senses

• unstructured(a = adj.all) Array - lacking definite structure or organization; "an unstructured situation with no one in authority"; "a neighborhood gang with a relatively unstructured system"; "children in an unstructured environment often feel insecure"; "unstructured inkblots"
Antonym: structured

• unstructured(s = adj.all) amorphous - lacking the system or structure characteristic of living bodies; Array