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