antediluvian

(noun) any of the early patriarchs who lived prior to the Noachian deluge. Synonyms: antediluvian patriarch.

(noun) a very old person. Synonyms: ancient.

(adj) of or relating to the period before the biblical flood. Synonyms: antediluvial. Example: "Antediluvian man."

(adj) so extremely old as seeming to belong to an earlier period. Synonyms: antiquated, archaic. Examples: "A ramshackle antediluvian tenement." "Antediluvian ideas." "Archaic laws."