摸头不着

Explanation: That somehow, at a loss 　　Usage: Verb-object type; as predicate, adverbial; containing derogatory 　　Source: Qing Wu Jingzi "The Scholars" The Sixth Round: "Zhao heard these words, on things not, and only in accordance with the words, write a letter of the word." Thesaurus:  not know why it is so, intangibility, extremely puzzled; be completely confused, mystery of mysteries— — extremely mysterious and abstruse, Figure it out, Puzzling, fathomless, Couldn't find north, Touch door vain, cannot distinguish whether it's genuine or fake,true or false, perplex Antonym Group:  deafening noise, Fakuizhenlong