The Oxford Thesaurus An A-Z Dictionary of Synonyms - knowledgeableadj.

1) knowledgable, aware, au fait, au courant, up to date, (well-) informed, (well-) acquainted, cognizant, familiar, enlightened, expert, knowing, Colloq in the know: She is knowledgeable about events in eastern Europe. 2) well-educated, erudite, learned, cultured, well-read, intelligent, sophisticated, worldly, wise, sage, sagacious: Professor Evans is one of the most knowledgeable people I have ever met.