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