personanon grata

persona non gra·ta (nŏn gräʹtə, grătʹə) adj.

Fully unacceptable or unwelcome, especially to a foreign government:

The diplomat was persona non grata.

  [Late Latin persōna nōn grāta: Latin persōna, person + Latin nōn, not + Latin grāta, feminine of grātus, acceptable.]

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