What is the Latin word for antediluvian?

The usual Latin words for “antediluvian” are sum, vetus, antīquus; also prīscus, obsolētus, exolētus. The right choice depends on the sense; see the distinctions below.

English → Latin

“antediluvian” in Latin

sumto be, exist; there be; to go vetusold, aged, elderly, ancient; long-standing; former, previous antīquusold, ancient; aged; time-honoured, bygone prīscusformer; ancient; old-fashioned obsolētusold, worn out, thrown off; obsolete, out-of-date; common, ordinary, mean, low exolētusmale prostitute

The English word antediluvian itself goes back to Latin dīluvium.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

antediluvian

*qui ante inundationem illam terrarum vixit, fuit, etc.

Old, primitive, vetus: antiquus, priscus, etc.

Old-fashioned, antiquus et obsoletus: obsoletus: exoletus.

Quick answer

What is the Latin word for antediluvian?: The usual Latin words for “antediluvian” are sum, vetus, antīquus; also prīscus, obsolētus, exolētus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.