'authentic' definitions:

Definition of 'authentic'

(from WordNet)
adjective
Conforming to fact and therefore worthy of belief; "an authentic account by an eyewitness"; "reliable information" [syn: authentic, reliable]
adjective
Not counterfeit or copied; "an authentic signature"; "a bona fide manuscript"; "an unquestionable antique"; "photographs taken in a veritable bull ring" [syn: authentic, bona fide, unquestionable, veritable]

Synonyms of 'authentic'

From: Moby Thesaurus