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:

• incurable/uncurable
• inadvisable/unadvisable
• insanitary/unsanitary.

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