Fake news is inauthentic and unauthentic
Inauthentic and unauthentic both mean the same thing: ‘not authentic’, i.e. not genuine or real.
Her apology was inauthentic.
Her apology was unauthentic.
A lot of the news on Facebook is inauthentic.
A lot of the news on Facebook is unauthentic.
Other in- and un- negatives also mean the same thing:
Learn more about words with my Business Writing online course.
Sign up for my monthly e-newsletter and receive writing and grammar tips.