antediluvian
/ˌantɪdɪˈluːvɪən/noun
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One who lived prior to Noah's Flood.
adjective
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Ancient or antiquated.
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Extremely dated.
"Those ideas are antediluvian."
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Pertaining or belonging to the time period prior to a great or destructive flood or deluge.
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Pertaining or belonging to the time prior to Noah's Flood.
Synonyms:
antediluvial, antediluvial, old, prehistoric, dated, old-fashioned, preflood