蛙かえるの面つらに水みず

expression

like water off a duck's back

Idiomatic expression meaning that criticism, scolding, or advice has no effect on someone, just as water splashes off a frog's face without bothering it. Often used when someone is shameless or thick-skinned.

• 彼かれに注ちゅう意いしても蛙かえるの面つらに水みずだ。

  Even if you warn him, it's like water off a duck's back.

• あの子こは叱しかられても蛙かえるの面つらに水みずで、すぐに同おなじことをする。

  That kid is like water off a duck's back when scolded; he does the same thing again right away.