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