persona non grata
noun [uncountable] (from Latin)a person who is not welcome in a particular place because of something they have said or done, especially one who is told to leave a country by the government 不受欢迎的人（尤指遭政府驱逐出境的） Their ambassador was declared persona non grata and forced to leave the country. 他们的大使被宣布为不受欢迎的人，被迫离开这个国家。
Word OriginLatin, from persona (Latin, literally ‘mask, character played by an actor’) + non ‘not’ + grata, feminine of gratus ‘pleasing’.