Meaning of unauthentic

1. The painting was deemed unauthentic by art experts, as it did not match the artist's known style.
2. The website was flagged for selling unauthentic designer handbags at a fraction of the price.
3. The professor warned students against using unauthentic sources in their research papers.
4. The company faced backlash for promoting unauthentic testimonials from paid actors.
5. The singer was criticized for her unauthentic performance, as it lacked emotion and passion.
6. The psychic's predictions were proven to be unauthentic when none of them came true.
7. The restaurant was accused of serving unauthentic Chinese food that did not resemble traditional dishes.
8. The company's unauthentic promise of overnight success led to many disappointed customers.
9. The politician's unauthentic smile did little to convince voters of his sincerity.
10. The antique dealer was caught trying to sell unauthentic artifacts as genuine historical pieces.