You might describe anything as "natural" for in some sense it is, everything in the physical world is nature. A great many nowadays employ the argument that because something is natural it is good, but they fail to realize that this is fallacious since that assumes nature and the good are synonymous, which renders the argument tautological. Furthermore, if nature is good then nothing in the physical world is bad, which is purist, and unless you think all bad is supernatural (and evil has no physical manifestation in the natural world, therefore there is no bad there), this should be unconvincing.