"authentic" in the adjective sense
1. authentic, reliable
conforming to fact and therefore worthy of belief
"an authentic account by an eyewitness"
"reliable information"
2. authentic, bona fide, unquestionable, veritable
not counterfeit or copied
"an authentic signature"
"a bona fide manuscript"
"an unquestionable antique"
"photographs taken in a veritable bull ring"
Source: WordNet® (An amazing lexical database of English)
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