This is the 10821st most frequent Korean word.
그런말로
"With such words" or "in such a way of speaking."
Here, '그런말로' means 'with such words,' used as an instrumental phrase to describe the means of teasing.
그런말로 친구를 놀리는 것은 좋지 않다.
Using such words to tease a friend is not good.
In this sentence, '그런말로' refers to 'in such a manner,' indicating the style or way of speaking.
그런말로 이야기하면 오해가 생길 수 있어.
Talking in such a manner could lead to misunderstandings.
Here, '그런말로' is used to mean 'with such words,' describing the cause of the upset feelings.