inauthenticity
noun/ˌɪnɔːθenˈtɪsəti/
/ˌɪnɔːθenˈtɪsəti/
[uncountable]- the fact of not being what somebody claims it is or not possible to believe or rely on opposite authenticity
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inauthenticity
Definition of inauthenticity noun from the Oxford Advanced Learner's Dictionary