不知所以

Explanation: To: why. Do not understand why this is so. That do not know why. 　　Usage: Verb-object type; as predicate, complement; describe one who is unknown underlying reason why the surprise 　　Source: Tangzhang Yan Yuan "law recorded in the book to buy Orchid Pavilion Preface": "suddenly see chasing calls, I do not know why." 　　Examples: Mimi suddenly picked up a lid, chopsticks banging bones with a knock up, knock him ~, panic-stricken, confused and disoriented. (Wang, "went") Thesaurus:  intangibility, extremely puzzled; be completely confused, mystery of mysteries— — extremely mysterious and abstruse, Figure it out, Puzzling, fathomless, Up on things vain, Couldn't find north, Touch door vain, cannot distinguish whether it's genuine or fake,true or false, perplex Antonym Group:  deafening noise, Fakuizhenlong