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(Latin, plural: personae non gratae), literally meaning "an unwelcome person". Most often used in diplomatic legalities to refer to a person who is unwelcome into specific foreign countries. The term Persona Non Grata has sort of a double meaning however. Persona is Latin for "Person", "Personality", or even "Mask", depending on context. Non Grata of course means "unwelcome". So the phrase could easily mean "an unwelcome mask" or "an unwelcome personality".