Inauthentic (adjective)

1. Not genuine or not conforming to the original.
2. Not real or not true.

Origin:

This word is derived from the late latin word "inauthenticus" which is formed by the combination of the prefix "in-" meaning "not" and the word "authenticus" meaning "genuine" or "true". .

Examples:

1. The art dealer was arrested for selling inauthentic paintings.
2. The restaurant was closed down for serving inauthentic Chinese food.
3. The diamond was found to be inauthentic and was a fake.
4. He was accused of giving inauthentic information on his CV.
5. The coin was inauthentic and was not a genuine antique.