SYNONYMS
outdated, out of date, outmoded, behind the times, old-fashioned, archaic, anachronistic, superannuated, outworn, ancient, antediluvian, primitive, medieval, quaint, old-fangled, obsolescent, obsolete, prehistoric
passé, démodé, vieux jeu
informal out of the ark, fossilized, as old as the hills, creaky, clunky, mouldy
British informal past its sell-by date, past one's sell-by date
Northern English informal antwacky
North American informal horse and buggy, mossy