1. not genuine or real; fake or false
2. not true to one’s own personality, spirit, or character; insincere

Examples

• The painting was revealed to be inauthentic after experts examined it.
• His apology felt inauthentic and rehearsed.
• The restaurant served inauthentic Italian food that disappointed the tourists.
• She criticized the movie for its inauthentic portrayal of historical events.
• The antique dealer was caught selling inauthentic artifacts.
• His smile seemed inauthentic during the interview.
• The documentary was criticized for presenting inauthentic accounts of the war.