a person who offers bad advice; villainous (/inept) adviser ? 你得想辦法揭露那個～的真面目。You've got to try to lay bare the true features of that vallainous adviser.
狗頭軍師gou tou jun shi
【方言】person who offers bad advice
狗頭軍師ɡǒu tóu jūn shī
軍師：古代掌管監(jiān)察軍隊的官名；也指在軍中出謀劃策的人。后多指那些專在背后出壞主意的人。villainous adviser, inept adviser, a good-for-nothing adviser