charlatanism

/ˈʃɑrlətəˌnɪzəm/
noun
  1. The practices or methods of a charlatan; fraud or deception, especially in claiming to have special knowledge or skills.
    • The magazine exposed the charlatanism behind the popular diet supplement.
    • The doctor was accused of charlatanism for selling fake cures to desperate patients.
    • Many people lost their savings to the investment advisor's charlatanism.
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