authentic
/ɒ.ˈθɛn.tɪk/adjective
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Of the same origin as claimed; genuine.
"The experts confirmed it was an authentic signature."
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Conforming to reality and therefore worthy of trust, reliance, or belief.
"The report was completely authentic."
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(of a Gregorian mode) Having the final as the lowest note of the mode.
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Authoritative
Synonyms:
credible, reliable, trustworthy, unfaked, bona fide, bonafide, genuine, real, unfaked
Antonyms:
fake, ingenuine, phony