五谷不分

Explanation: Grain usually refers to rice, millet, millet, wheat, beans. That do not participate in labor, can not distinguish grains. Described from productive labor, lack of productive knowledge. 　　Usage: The main predicate; as the predicate attribute; containing derogatory 　　Source: "Analects XVIII," four sedentary, The journey, who for Master? " 　　Examples: Our young people will not do a new era ~ the bookworm. Thesaurus:  cannot tell beans from wheat, Guiltless Ding Dong