무지렁이 (mu-ji-reong-i) – a moron/stupid person
This word has a similar meaning as 바보 so don’t use this on someone whom you don’t know well – it’d be very rude.
남에게 무지렁이라는 말을 하지 말고 너무 무례해서.
Don’t use the word “moron/stupid person” towards strangers becaus it’s really rude.
그 남자가 친구에게 자꾸 무지렁이라고 해서 학생들이 싫어.
That guy always calls his friends “moron/stupid person” so the students dislike him.