This means you strongly decide not to do something. It can also mean you must not do something. Or, it can mean something is impossible to imagine.
This means you strongly decide not to do something. It can also mean you must not do something. Or, it can mean something is impossible to imagine.
I swore to myself that I would never tell this secret to anyone.
Behavior unbecoming of a politician leads to losing the public's trust.
I shall never repeat that mistake again.
Even if my body is destroyed, I will not hand over this castle.
It is absolutely unthinkable that he would betray a friend.
This grammar adds a strong feeling. It means something is very wrong or should never happen. It is like saying 'absolutely not' or 'unthinkable'.
Both '〜まじ' and '〜べからず' mean "must not." But they are different. Use '〜まじ' when you decide not to do something. Or when you think something should not happen. Use '〜べからず' for rules for everyone. You see it on signs. For example, "Do not enter." '〜まじ' is much stronger than '〜ないだろう' for saying something is unlikely.
Don't use this when you talk with friends. It is for formal writing or speeches. You can also see it in old stories.
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