silver-tongued
From Longman Dictionary of Contemporary Englishsilver-tonguedˌsilver-ˈtongued adjective literary EXPRESSgood at talking to people and making them like you, or persuading them to do what you want SYN charmingExamples from the Corpussilver-tongued• Sometimes we do get fooled by all that beautifully packaged, silver-tongued hype of the record companies.