1. antediluvian, antediluvian patriarch

any of the early patriarchs who lived prior to the Noachian deluge

• antediluvian patriarch

2. ancient, antediluvian

a very old person

• ancient

3. antediluvial, antediluvian

of or relating to the period before the biblical flood

Example Sentences:
'antediluvian man'

• antediluvial

4. antediluvian, antiquated, archaic

so extremely old as seeming to belong to an earlier period

Example Sentences:
'a ramshackle antediluvian tenement'
'antediluvian ideas'
'archaic laws'

• antiquated
• archaic