1. Belonging to the period before the Biblical flood; ancient or prehistoric
Antediluvian civilizations have fascinated archaeologists for centuries.
As civilizações antediluvianas fascinaram arqueólogos por séculos.
2. Extremely old, outdated, or primitive; belonging to a very distant past
His antediluvian beliefs about technology make him resistant to using computers.
Suas crenças antediluvianas sobre tecnologia o tornam resistente ao uso de computadores.