Used in the phrase 'persona non grata,' meaning an unwelcome or unwanted person; the Latin term indicates something that is welcome or acceptable.
From Latin 'gratus,' meaning pleasing or welcome. The phrase 'persona non grata' (unwelcome person) became standardized diplomatic terminology, where 'grata' retained its Latin feminine form.
Diplomats created 'persona non grata' as a fancy way to say 'get out' without starting a war—it's so formal that kicking someone out of a country sounds almost polite, which is why bureaucracy invented it.
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