恬不知怪

Explanation: That the Department of Enron, does not think it strange. Language of the Han Jia Yi "security policy": "As for the loss of customs, the world lost bad, because I do not know Tim and strange." 　　Source: A phrase from the Han Jia Yi "security policy" The loss of customs, the world lost bad, because Tim and I do not know weird. "Song Su" thank rounding the table in the book "both ends of any precepts, it is the right move in the history Xu, Tian strange I do not know, learning to Guchang." 　　Examples: Xiangyan the course of time, ~, but unfortunately there are who go without. ★ Qing Liu Xianting "Yang Guang Miscellanies," Volume Thesaurus:  Not surprised at all To blame