Synonyms of antediluvian in English:

antediluvian


See definition of antediluvian

adjective

1‘gigantic bones of antediluvian animals’

SYNONYMS

before the flood, prehistoric, primeval, primordial, primal, earliest, ancient, early

rare primigenial

2‘his antediluvian attitudes’

SYNONYMS

out of date, outdated, outmoded, old-fashioned, ancient, antiquated, archaic, antique, superannuated, anachronistic, outworn, behind the times, primitive, medieval, quaint,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

passé

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

ANTONYMS

modern, up to date