One of the mysteries of the English language finally explained.
1‘gigantic bones of antediluvian animals’
before the flood, prehistoric, primeval, primordial, primal, earliest, ancient, early
2‘his antediluvian attitudes’
out of date, outdated, outmoded, old-fashioned, ancient, antiquated, archaic, antique, superannuated, anachronistic, outworn, behind the times, primitive, medieval, quaint, old-fangled, obsolescent, obsolete, prehistoric
informal out of the ark, fossilized, as old as the hills, old hat, creaky, mouldy, clunky
British informal past its sell-by date, past one's sell-by date
North American informal horse and buggy, mossy
modern, up to date
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