authentically C2+

/ɔˈθɛntɪkli/ in a genuine or true manner M S

authentication C2+

/ɔˌθɛntɪˈkeɪʃən/ the process of verifying that something is genuine or valid M S

authenticness C2+

/ɔˈθɛntɪknəs/ the quality of being genuine or authentic M S

inauthentic C2+

/ˌɪnɔˈθɛntɪk/ not genuine or true to itself; fake or insincere M S