不识不知

Explanation: Do not have much knowledge. Old Yu simple and sincere. 　　Usage: Joint type; as predicate, attributive; with commendatory 　　Source: Cheng Lie Yukou Warring States "Lie Zi Zhong Ni": "Yao is a micro-service tour in Hong Qu, Wen said, children nursery rhymes: 'Li I steamed the people, bandits Er Mo pole, did not know I do not know, Shun, who favored the then'." 　　Examples: However, Chang Wen Yao and Shun the world, on the 10th a wind and rain on the 5th one, people, farming and food, well drilling and drink, the so-called "~ Shun, who favored the then" is also. (Ming Feng Meng, "East Zhou," 18th Back Thesaurus:  Unconsciously, spirit guiltless, ghost cannot help, Person without our noticing, dottiness