b : extremely primitive or outmoded <an antediluvian prejudice>
(I was much surprised this week to see that a technologically advanced workplace, despite being advanced, has some antediluvian equipment! This word is often used to exaggerate or to make one's point tongue-in-cheek, as I'm sure you can surmise from the definition and the origin :)
- He has antediluvian notions about the role of women in the workplace.
- <found evidence in the Middle East of an antediluvian people previously unknown to history>