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Anonymous
Properly it is "persona non grata" and is a Latin phrase.
It has two primary definitions.
1. A diplomat who is unacceptable to the government to which he is sent.
2. A person who is not welcome or wanted for some reason.
Wiki User
"Persona non grata" is a Latin term meaning "an unwelcome person." It is often used in diplomatic contexts to describe a foreign diplomat or official who is no longer acceptable to the host country, leading to their expulsion. The term can also be applied more broadly to indicate someone who is not welcome in a particular social or professional setting.