まじき

auxiliary adjective, noun-modifying (irregular)

should not be; must not be

Archaic or formal auxiliary adjective used in the pattern あるまじき to express strong prohibition or unacceptability, often in set phrases like あるまじき行為 (unbecoming conduct).

See also: まじ

• 政せい治じ家かにあるまじき発はつ言げんだ。

  That is a remark unbecoming of a politician.

• 教きょう師しとしてあるまじき行こう為いだった。

  It was conduct unbecoming of a teacher.