Explanation
Used to express what should not be done; 'must not', 'should not'.
Formation
Verb-dictionary form + べからざる + Noun
Detailed explanation
The Japanese grammar point Verbる べからざる Noun is used to indicate something that should not be done, or is not allowed to be done. It translates to 'must not' or 'should not' in English. It is often used in formal written Japanese or in formal speeches. It is constructed by using the verb in its dictionary form followed by 'べからざる' and a noun, usually related to behavior or events.
Examples
Hito o uragiru bekara zaru koui da.
Betraying others is an act that must not be done.
Kodomo o kizutsukeru bekara zaru koudou da.
Hurting a child is a behavior that must not happen.
Ooyake ni uso o tsuku bekara zaru koudou da.
Lying publicly is an act that should not be done.
Tanin no zaisan o okasu bekara zaru koui da.
Infringing on someone else’s property is an act that must not be performed.
Practice
Grammar content sourced from hanabira.org.