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• s  artfully persuasive in speech
  a smooth-tongued hypocrite

• He is very pugnacious, but is also a smooth-tongued type.
• Aside from Franklin Rooseveltwho is rated an amateursmooth-tongued, silver-haired, 46-year-old Funnyman Jack Benny is the biggest voice in radio.
• He found that squads of oily, smooth-tongued salesmen had combed Cleveland with tales of a great shortage of burial ground.

• glib
• glib-tongued