Being that everything in the universe we can possibly perceive exists within the natural universe could anything that happens really be "unnatural"?
This thinking seems to apply to the "supernatural" as well. I guess the underlying meaning to the word unnatural is something like "invoked by human intervention" but the word at its core to me is oxymoronic.
The word seems outdated to me as it implies that we are above nature. It implies that we are so special that there are courses of action we can take that are above nature. It seems like a product of our arrogance. This brings up another question. What's more important? The dictionary definition of a word or the axiomatic meaning?