不知好歹

Explanation: Do not know good or bad. Many that can not understand other people's good intentions. 　　Usage: Verb-object type; as predicate, attributive; that does not distinguish good and bad 　　Source: Minglan Ling Xiao Xiao Sheng "words ending in" 87 back: "That Old Woman ungrateful, they ridiculed him, and sent out Wu Song." 　　Examples: Aroma also helped rebuff me that my many ~ if not the main back up the. (Cao Xueqin, "Dream of Red Mansions," the 46th back) Thesaurus:  undiscriminating, fail to appreciate sb's kindness, free flatter, Not in flatter