Unnatural doesn't really exist.
But for common English purposes it is anything humans make or cause to happen.
The Grammar Nazi does not know the origin of words.
The prefix "Un-" means opposite.
And the way you define "natural" can very and by some accounts we would be considered under the "natural order."
The opposite of the natural order does not exist.
And this is why I am not a Grammar Nazi.
I would rule you all.
Motherfluckin Kecleon, let me shoplift in peace...
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♦ The Fuchsia City Guru ♦
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Trying to motivate myself to play: Ace Attorney 5, Strange Journey, Skyrim.