a person who is not wanted or welcome in a particular country, because they are unacceptable to its government

He was declared persona non grata and asked to leave the country within 48 hours. 他被宣布为不受欢迎的人，限期在48小时内离开该国。

someone who is not popular or accepted by others

From the look on their faces, I was obviously persona non grata. 从他们的表情上来看，我显然是不受欢迎的人。