不舞之鹤

Explanation: Dance: Dance. Crane does not dance. Analogy unworthy of the name of the person. Also used to ridicule people incompetent. 　　Usage: Partial official; as subject, object; sarcastic inability to 　　Source: Southern Song Liu Yiqing "Shi Pai transfer": "Xi Yang Shuzi a crane and a good dancer, to try to call it off, try to drive off, the Tong Meng refused to dance." 　　Examples: Fang Zi slaughter, the loose cut twenties, had kept control Xu, and dull Fucai, to resort to public humiliation for the sheep ~. (Qing Pu, "Strange Tales of prison break") Thesaurus:  stumblebum