Tartarean

adjective

Tar·​tar·​e·​an tär-ˈter-ē-ən 

: of, relating to, or resembling Tartarus : infernal

were thrown headlong … into the Tartarean abyss

—Edward Gibbon

Word History

Etymology

Latin tartareus, from Greek tartareios, from Tartaros Tartarus

First Known Use

1592, in the meaning defined above