Japanese phrase
___は理由になりません。 ___ wa ri yū ni na ri ma se n
Meaning
___ is not a valid reason.
When to use it
Rejects a stated reason as insufficient. It sounds firm and critical, often in workplace or school situations.
Example dialogue
すみません、寝坊しました。 su mi ma se n ne bō shi ma shi ta
I am sorry, I overslept.
寝坊したのは理由になりません。 ne bō shi ta no wa ri yū ni na ri ma se n
Oversleeping is not a valid reason.