不知羞耻 BTW:你提问时应该用“吗”而不是“马”

Now the Chinese call names don't say dirty words. For example: 水至清则无鱼，人至贱则无敌。or 树不要皮，必死无疑，人不要脸，天下无敌。 Such as these, there are many

不要B脸

恬不知耻

You can say ”无耻“，which meaning is same with shameless.