prehistoric

having passed its time of use or usefulness prehistoric notions about mental illness that have no place in today's world Synonyms antiquated, archaic, dated, démodé, demoded, fossilized, kaput (also kaputt), medieval (also mediaeval), moribund, mossy, moth-eaten, neolithic, Noachian, outdated, outmoded, out-of-date, outworn, passé, obsolete (also prehistorical), rusty, Stone Age, superannuatedRelated Words aging (or ageing), obsolescent; discarded, disused, inoperable, unusable, unworkable, useless; dead, defunct, expired, extinct, vanished; dormant, fallow, free, idle, inactive, inert, inoperative, latent; ancient, antediluvian, antique, dateless, fusty, musty, old; oldfangled, old-fashioned, old-time, retro, vintage; aged, age-old, hoary, venerable; atavistic, bygone, erstwhile, former, historic, historical, late, old-world, pastNear Antonyms contemporary, current, mod, modern, new, newfangled, new-fashioned, present-day, recent, ultramodern, up-to-date, up-to-the-minute; fresh; modernized, refurbished, remodeled, renewed; functional, operable, operational, workable; active, alive, busy, employed, functioning, operating, operative