antediluvian

 
Pronunciation: /ˌantɪdɪˈluːvɪən/

adjective

  • of or belonging to the time before the biblical Flood: gigantic bones of antediluvian animals
  • chiefly humorous ridiculously old-fashioned: they maintain antediluvian sex-role stereotypes

Origin:

mid 17th century: from ante- + Latin diluvium 'deluge' + -an