Brunir belong to the 2nd
group. Brunir is a common french verb.
Brunir is conjugated the same way that verbs that end in : -ir
Brunir is conjugated with auxiliary avoir
Brunir verb is
direct transitive, intransitive.
French verb brunir can be conjugated in the reflexive form: Se brunir
verb is a direct transitive verb, so passive voice can be used.