The word "un-artificial" refers to something that is natural, genuine, or authentic. On the other hand, the antonyms for this word could be synthetic, artificial, or fake. Synthetic refers to a product that is made from artificial materials or chemical substances, whereas artificial pertains to something that is not natural, but man-made or created by humans. Fake is a term used to describe something that is not genuine or authentic, like a counterfeit product. It is essential to know the antonyms of the word "un-artificial" to communicate ideas more effectively and accurately.