薬籠 やくろう ちゅう ものじゃないです
yakurōchūno monojanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 薬籠中の物

1. It's not something to be taken lightly.; It's a serious matter.; It's not child's play.

Negative
Polite
Casual Register