smooth tongued

/smuːð tʌŋd/
adjective
  1. Speaking in a very polite or flattering way, often to persuade or deceive someone.
    • She was smooth-tongued, always saying exactly what people wanted to hear.
    • The smooth-tongued salesman convinced me to buy a car I didn't need.
    • Beware of smooth-tongued politicians who make big promises they can't keep.
Antonyms
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