authentic
Pronunciation:
/ɒ.ˈθɛn.tɪk/adjective
Definitions
Of the same origin as claimed; genuine.
Example: The experts confirmed it was an authentic signature.
Conforming to reality and therefore worthy of trust, reliance, or belief.
Example: The report was completely authentic.
(of a Gregorian mode) Having the final as the lowest note of the mode.
Authoritative