不稂不莠

Explanation: Grass: Penni_set_um; atrazine: _Set_aria. This means the seedlings in the weed-free. After the analogy of people do not become, a failure. 　　Usage: Joint type; as the predicate attribute; describe one who is not promising 　　Source: "Book of Songs Xiaoya field": "not only firm not only good, worthless." Zhu Xi _set_ Chuan: "grass, Tong Liang; herbicides, like seedlings. Were also victims of the grass seedlings." 　　Examples: First we go to learn his own; otherwise, ~, and anti-delayed family girl, would not pity. (Qing Cao Xueqin's "Dream of Red Mansions," the eighty-fourth back) Thesaurus:  neither fish,flesh nor fowl