systemless

Without system; in biology, not exhibiting any of the distinct systems or types of structure characteristic of most organisms, as the radiate in the vegetable kingdom, and the vertebrate, etc., in the animal kingdom; lacking differentiated or specialized tissues; structureless: as, in the vegetable kingdom the Algæ and in the animal kingdom the Protozoa are systemless.

Being without system.

Not agreeing with some artificial system of classification.

Not having any of the distinct systems or types of structure, as the radiate, articulate, etc., characteristic of organic nature.

lacking organised or systematic structure; without a system