Synonyms and Antonyms of prehistoric
- prehistoric notions about mental illness that have no place in today's world
antiquated, archaic, dated, démodé, demoded, fossilized, kaput (also kaputt), medieval (also mediaeval), moribund, mossy, moth-eaten, neolithic, Noachian, obsolete, out-of-date, outdated, outmoded, outworn, passé, rusty, Stone Age, superannuated
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, past