不识好歹

Explanation: Knowledge: to know; bad: bad. Do not know what is good and what is bad 　　Usage: Verb-object type; as predicate, attributive; that people do not tell right from wrong, good intentions do not understand others 　　Source: Ming Wu Cheng-en, "Journey to the West" 26 back: "You Pohou, Bushihaodai!" 　　Examples: To you that reading classics are always good intentions; ancient books are not poison, could it be nonsense up, it is obvious that ~ Yeah! ★ XIA Mianzun, tao "Oncidium" 15 　　Results: As the donkey kind of dry lung 　　Postscript: As the donkey kind of dry lung Thesaurus:  not know chalk from cheese, fail to appreciate sb's kindness, free flatter, Not in flatter