bona_fide
1. [ adjective ] undertaken in good faith
Examples:

"a bona fide offer"

Related terms: sincere
2. [ adjective ] not counterfeit or copied
Synonyms: authentic veritable unquestionable
Examples:

"an authentic signature" "a bona fide manuscript" "an unquestionable antique" "photographs taken in a veritable bull ring"

Related terms: genuine