- authentic, reliable - conforming to fact and therefore worthy of belief; "an authentic account by an eyewitness"; "reliable information"
Antonyms: untrustworthy, untrusty (indirect, via trustworthy)
- 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"
Antonyms: counterfeit, imitative (indirect, via genuine)