Charlatanism (noun)

1. The practices or actions of a charlatan; quackery or deception.
2. Deceitful or fraudulent behavior or actions, especially in the field of medicine or psychology.

Origin:

Derived from the word "charlatan" which is derived from the italian word "ciarlatano" meaning "quack" or "impostor".

Examples:

1. He was accused of charlatanism for claiming that his potion could cure all illnesses.
2. The psychic's predictions were exposed as charlatanism.
3. The alternative medicine practitioner's methods were deemed charlatanism by the medical community.
4. The public was warned against falling prey to charlatanism in the field of finance.
5. The company was accused of charlatanism for claiming that their products had health benefits they didn't have.