Ancient
First
Synonyms Of long ago, first, past, bygone, primeval, primitive, olden, foregone, earliest, early, former, prehistoric, primordial, classical, and of yore.
Antediluvian
Synonyms Old, age-old, time-worn, immemorial, atavistic, very old, antediluvian, time-honoured, and long-lived.
Archaic
Synonyms Antiquated, antediluvian, obsolete, superannuated, old-fashioned, outmoded, elderly, hoary, démodé, fossilized, cobwebby, out of the ark, clunky, past its/one's sell-by date, mossy, archaic, medieval, obsolescent, anachronistic, out of date, aged, venerable, decrepit, passé, as old as the hills, in one's dotage, creaky, mouldy, antwacky, and horse and buggy.
Example Sentences
The ruins are from ancient times.
She studied ancient history extensively.
Ancient civilizations fascinate historians and archaeologists.
They discovered an ancient artifact yesterday.