The parent mentioned Persona Non Grata. Many people, including non-native speakers, may be unfamiliar with this word. Here is the definition^{(In beta, be kind):}

In diplomacy, the term persona non grata (Latin, plural: personae non gratae), literally meaning "person not appreciated", refers to a foreign person whose entering or remaining in a particular country is prohibited by that country's government. It is the most serious form of censure which one country can apply to foreign diplomats, who are otherwise protected by diplomatic immunity from arrest and other normal kinds of prosecution. Persona non grata can also refer to "A person without standing" in the matters at hand, legal or otherwise. [View More]

^{See also: Prostitution | Persona | Diplomatic Immunity | Accredit | Censure | Diplomacy | Peculiar}

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