A more thorough explanation:

Definition: Persona non grata (pronounced pər-soh-nə non grah-də), is a Latin term used to describe an unwanted person, especially a diplomat who is not accepted by the host country. The plural form is personae non gratae. This term is often used in diplomatic circles.

• After the spy scandal, the ambassador was declared persona non grata and was asked to leave the country immediately.
• The journalist was declared persona non grata by the government for reporting on sensitive issues.
• The athlete was declared persona non grata by the sports federation for violating the code of conduct.

These examples illustrate how the term persona non grata is used to describe a person who is not welcome or accepted in a particular situation. In the first example, the ambassador was asked to leave the country because of the spy scandal. In the second example, the journalist was not allowed to report on sensitive issues. In the third example, the athlete was not allowed to participate in the sport due to a violation of the code of conduct.