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Adjective: silver-tongued  'sil-vu(r)'túngd
  1. Speaking readily, clearly, and effectively
    "The silver-tongued orator swayed the audience with his persuasive arguments";
    - eloquent, facile, fluent, silver, smooth-spoken
     
  2. Exceptionally persuasive or eloquent in speech
    "The silver-tongued orator swayed the entire audience"

See also: articulate