This means something is not right to do. It is especially used when someone in a certain role does something wrong.
Verb [dictionary form] + まじき + NounPrimary
Noun + に + ある + まじき + Noun
This means something is not right to do. It is especially used when someone in a certain role does something wrong.
味方を裏切るなど、武士にあるまじき振る舞いである。
Betraying one's allies is behavior unbecoming of a samurai.
政治家にあるまじき発言で、国民の信頼を失った。
He lost the public's trust with a comment unbecoming of a politician.
教師として許すまじき行為であり、厳罰に処すべきだ。
As a teacher, it is an unforgivable act, and they should be severely punished.
スポーツ選手として、相手を侮辱するような言葉は口にするまじきものだ。
As an athlete, one should not utter words that insult an opponent.
それは、彼にとって思い出すまじき過去の出来事だった。
For him, that was an event from the past that should not be recalled.
This grammar shows that something is very wrong. It is like saying 'a doctor should not lie'. The 'ni aru' part means 'for a doctor'. It makes it clear why the action is bad for that person.
Other negative words just say "do not." But "〜まじき" means something is very wrong. It judges an action as bad. "〜まじき" is for actions that are wrong for a certain person. "〜べからず" is for general rules, like "Do not enter."
Don't use this when you are talking to friends. For example, don't say "That was an unacceptable thing for a friend to do." This phrase is very old-fashioned. It is only for very formal writing. You might see it in newspapers. Or in legal papers. It means something is very wrong. It means it is unforgivable. It is for someone in a special job. Or someone with a certain role. It means they should never do that thing. It means it is "unbecoming" of them.
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