bo·na fide 
(bōnə fīd′, fīdē, bŏnə)
(bōnə fīd′, fīdē, bŏnə)adj.
1. Made or carried out in good faith; sincere: a bona fide offer.
2. Authentic; genuine: a bona fide Rembrandt. See Synonyms at authentic.
[Latin bonā fidē : bonā, feminine ablative of bonus, good + fidē, ablative of fidēs, faith.]