Radoucir belong to the 2
nd group.
Radoucir is conjugated the same way that verbs that end in :
-ir
Radoucir is conjugated with
auxiliary avoir.
Radoucir verb is direct transitive, intransitive.
French verb radoucir can be conjugated in the reflexive form:
Radoucir verb is a direct transitive verb, so ive voice can be used.