Open English Wordnet
Nouns
(n)antediluvian, antediluvian patriarchany of the early patriarchs who lived prior to the Noachian deluge
Adjectives
(a)antediluvian, antediluvialof or relating to the period before the biblical flood“antediluvian man”
(s)antediluvian, antiquated, archaicso extremely old as seeming to belong to an earlier period“a ramshackle antediluvian tenement”, “antediluvian ideas”, “archaic laws”