What is persona non grata? The expression "persona non grata” is widely used in the audiovisual environment. So, most likely you've heard it in some soap opera, series or movie. Even so, many people don't know what the term means.
The Latin phrase means nothing more and nothing less than someone who is not welcome in some environment. That is, someone who was forbidden to be in a certain place, and he could be anyone.
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In diplomacy the term has a technical meaning. Therefore, a diplomat who, by determination of the country's government, is not welcome is persona non grata. And the reasons can be many, but in general, the government of the nation where he is located considers him against national interests.
However, even though the expression is widely used in diplomacy, it can be used in our daily lives. Someone in the family, a group of friends, or even at work could be persona non grata.