Verb (dictionary form) + まじき + Noun

[Should not; unbecoming of; unworthy of]

Connection: Verb (dictionary form) + まじき + Noun (する → するまじき / すまじき)

Usage: Expresses strong disapproval, indicating that an action is unacceptable or unworthy for a particular role or status. Very formal and literary. Most commonly seen in the pattern 「〜にあるまじき」(unbecoming of someone in the position of...).

Common patterns:

• 教師にあるまじき行為 (conduct unbecoming of a teacher)
• 許すまじき犯罪 (an unforgivable crime)
• 人としてあるまじき行為 (conduct unworthy of a human being)

Examples:

それは教師にあるまじき行為だ。(That is conduct unbecoming of a teacher.)

公務員としてあるまじき発言をしてしまった。(I made remarks unworthy of a public servant.)

許すまじき犯罪に対して、厳しい処罰が求められる。(Strict punishment is called for against unforgivable crimes.)