ingenerate
Not generated, self-existent.
rare
The first Synod of Sirmium anathematises those who […] identify the Holy Ghost with the Ingenerate God.
Where it comes from
First attested in 1656; borrowed from Late Latin ingenerātus, from in- (“not”) + generātus.
Adapted from the Wiktionary entry ingenerate (CC BY-SA 4.0).