Synonyms of antediluvian in English:

antediluvian


See US English definition of antediluvian

See UK English definition of antediluvian

See Spanish definition of antediluviano

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out of date, outdated, outmoded, old-fashioned, ancient, antiquated, archaic, antique, superannuated, anachronistic, outworn, behind the times, primitive, medieval, quaint,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
Northern English informal antwacky
North American informal horse and buggy, mossy
ANTONYMS

modern, up to date