たものではない

Impossible

JLPT

Structure

V-た + ものではない

Meaning

Comes after verbs indicating ability such as [できる] (can do), [分かる] (understand), to emphasize the negative mood "cannot do that".
Typically used in casual speech, and in an intimate manner, it would be [もんじゃない]. Used for negative evaluations.

こんなまずいお

茶ちゃ

、

飲の

めたもんじゃない

。

I shouldn't have been able to drink such bad tea.

こんな

難むずか

しい

本ほん

は