highly evolved Antonyms

underivative rudimentary rudimental retarded reactionary procreative primordial primogenial primitive primeval subnormal sustained out-of-date undeveloped underdeveloped unprogressive nonprogressive atavistic underived vestigial underlying primal preglacial embryotic embryonic dated continued clung basilar backward archaic antique feeble-minded fetal natal nascent lagging initiatory inchoative inchoate inceptive gestatory fud anachronous