1. to seem genuine, real, or true; to give the impression of being authentic
The antique painting appears authentic after expert examination.
A pintura antiga parece autêntica após exame de especialista.
2. to have the characteristics or qualities that suggest something is genuine rather than fake or imitation
His story appears authentic because of the specific details he provided.
A história dele parece autêntica por causa dos detalhes específicos que forneceu.