THESAURUS
immemorial
acknowledged, admitted, age-old, ageless, ancient, antique, auld, ceaseless, coeternal, constant, continual, continuous, conventional, customary, dateless, early, elderly, endless, erstwhile, established, eternal, eterne, ever-being, ever-durable, ever-during, everlasting, everliving, fixed, folk, fore, former, hallowed, handed down, heroic, hoary, incessant, indestructible, infinite, interminable, inveterate, late, legendary, long-established, long-standing, mythological, never-ceasing, never-ending, nonstop, nonterminating, nonterminous, of long standing, of old, of the folk, of yore, olamic, old, old as Methuselah, old as history, old as time, old-time, olden, once, onetime, oral, past, perdurable, permanent, perpetual, prehistoric, prescriptive, previous, primeval, primitive, prior, quondam, received, recent, recognized, rooted, sempiternal, sometime, steady, then, time-honored, timeless, traditional, tried and true, true-blue, unceasing, understood, unending, unintermitting, uninterrupted, unremitting, unwritten, venerable, without end, worshipful
ROGET THESAURUS
immemorial
Oldness
N
oldness, age, antiquity, cobwebs of antiquity, maturity, decline, decay, senility, seniority, eldership, primogeniture, archaism, thing of the past, relic of the past, megatherium, Sanskrit, tradition, prescription, custom,
immemorial usage, common law, old, ancient, antique, of long standing, time-honored, venerable, elder, eldest, firstborn, prime, primitive, primeval, primigenous, paleolontological, paleontologic, paleoanthropological, paleoanthropic, paleolithic, primordial, primordinate, aboriginal, diluvian, antediluvian, protohistoric, prehistoric, antebellum, colonial, precolumbian, patriarchal, preadamite, paleocrystic, fossil, paleozoolical, paleozoic, preglacial, antemundane, archaic, classic, medieval, Pre-Raphaelite, ancestral, black-letter,
immemorial, traditional, prescriptive, customary, whereof the memory of man runneth not to the contr, inveterate, rooted, antiquated, of other times, rococo, of the old school, after-age, obsolete, out of date, out of fashion, out of it, stale, old-fashioned, behind the age, old-world, exploded, gone out, gone by, passe, run out, senile, time worn, crumbling, secondhand, old as the hills, old as Methuselah, old as Adam, old as history, Archeozoic, Proterozoic, Paleozoic, Mesozoic, Cenozoic, Precambrian, Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, Permian, Triassic, Jurassic, Cretaceous, Tertiary, Paleogene, Neocene, Quaternary, Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, Recent, since the world was made, since the year one, since the days of Methuselah, vetera extollimus recentium incuriosi.