flyswatter(파리채), impish, unassailable

Fly swatter(swɑ́tər) = 파리채

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 ​showing a child's ​pleasure in ​enjoying yourself and making ​trouble:At 70, he still ​retains his impish ​grin.
suggesting ​behavior that is ​playful but ​likely to ​upset other ​people:
He had an impish ​grin on his ​face.
(심각하지 않을 정도로) 버릇없는[장난스러운] = impish
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in such a ​strong ​position that you cannot be ​defeated: 누구도 따라 잡을 수 없는                                           의기양양한(승리해서, 아무도 따라 잡지 못해                                    서)This ​win has given the ​team an unassailable ​lead.The ​president ​looked unassailable with over 60 ​percent of the ​vote. ​impossible to ​doubt or ​argue with:=> 헛점이 없는, 반박할 수 없는unassailable ​logicThe ​conclusions were unassailable. ​impossible to ​attack: 난공불락의an unassailable ​fortress