Malfeasance (noun)

1. The commission of an unlawful or immoral act, especially by a public official.
2. The abuse of power or trust, especially by a public official.
3. Conduct that is illegal or unethical.

Origin:

The word malfeasance comes from the old french word malfaisance meaning "evil-doing", which is composed of the prefix "mal" meaning "bad" and "faire" meaning "to do" or "to make". it refers to the commission of an unlawful or immoral act, or the abuse of power or trust, especially by a public official.

Examples:

1. The investigation revealed that the official had engaged in malfeasance.
2. The company was accused of malfeasance in the handling of its finances.
3. The malfeasance of the public official was a major scandal.
4. The malfeasance was a violation of the public trust.
5. The malfeasance in the government was a major issue.