knowledgeable(having knowledge, especially of a particular subject) adjective [UK: ˈnɒ.lɪ.dʒəb.l̩] [US: ˈnɑː.lə.dʒəb.l̩]
learned(having much learning) adjective [UK: lɜːnd] [US: ˈlɝːnd]Fluent in English, French, Spanish and German, Paul Morphy was one of the most learned chess players of his time. = Con fluidez en inglés, francés, español y alemán, Paul Morphy fue uno de los ajedrecistas más eruditos de su tiempo.
scholarly(relating to scholars or scholarship) adjective [UK: ˈskɒ.lə.li] [US: ˈskɑː.lər.li]
scholar [scholars](specialist in a particular branch of knowledge) noun [UK: ˈskɒ.lə(r)] [US: ˈskɑː.lər]Judging from what you say, he must be a great scholar. = A juzgar por lo que dices, el debe ser un gran erudito.