This is the 10808th most frequent Korean word.
그딴
"그딴" means "such" or "that kind of," often with a dismissive or negative connotation.
Here, '그딴' implies a dismissing or belittling attitude towards the 'kind of thoughts' referred to.
그딴 생각은 필요 없어요.
Such thoughts are not needed.
In this sentence, '그딴' refers to the type of words or expressions mentioned, with a connotation of disapproval.
그딴 말 하지 마세요.
Don't say things like that.
Here, '그딴' describes a 'type of person,' often connoting disdain or lack of trust towards such a type.