adjective
antediluvian
an-tee-dih-LOO-vee-un/ˌæntidɪˈluːviən/
Extremely old-fashioned or ancient.
The antediluvian telephone looks enormous beside the smartphone.

Etymology
Before the Flood became a way to describe anything so old it feels ancient or obsolete.
More examples
- The office still relies on antediluvian equipment.
- His antediluvian views surprise his younger colleagues.
Forms
antediluvian
Similar words
- antiquated
- Emphasizes being outdated.
- archaic
- Often describes forms or practices belonging to an earlier age.