adjective
describing something as not authentic or genuine
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The art critic described the painting as inauthentic, noting inconsistencies in the artist's style.
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I can tell that the signature on this watch is inauthentic, it's definitely a knock-off.
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That apology seemed so inauthentic, I could tell they didn't really mean it.
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Her smile looked inauthentic, like she was forcing it for the camera.