Noun
silver tongue (plural silver tongues)
(idiomatic) The trait of being clever at speaking, often in a deceitful way.
It is when youth has fled and frailty is suddenly palpable that you lapse into the rhythm of routine with oil, silver tongue cleaners (₹1,500), and pretty pots. Source: Internet
Playing the character for over a decade — and bringing audiences far and wide to the theater — Downey became the billionaire playboy philanthropist with a silver tongue, a bit of a superiority complex, and an arrogant air of omniscience. Source: Internet