Synonyms and Antonyms for antediluvian

1. antediluvian (adj.)

of or relating to the period before the biblical flood

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2. antediluvian (adj.)

so extremely old as seeming to belong to an earlier period

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3. antediluvian (n.)

a very old person

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4. antediluvian (n.)

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

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