Antonyms of QUACK

Examples of usage:

  1. What do you want with him- not medicine of that old quack, that dreadful man? "Northern Lights" by Gilbert Parker
  2. Why should I burn in the pit, or throw myself overboard, or go down to the shades for a quack, because a thing like you has crawled out of the Tottenham Court Road. "Foe-Farrell" by Arthur Thomas Quiller-Couch
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