(a.) Tending or liable to backslide or relapse to a former condition or habit.

aboriginal ancestral antepatriarchal autochthonous bodily born coeval congenital connatal connate connatural constitutional genetic hereditary humanoid in the blood inborn inbred incarnate indigenous inherited innate instinctive instinctual native native to natural natural to organic patriarchal physical preadamite preglacial prehistoric prehuman primal prime primeval primitive primogenial primoprimitive primordial pristine protohistoric protohuman reactionary recessive recidivist recidivous regressive retrograde retrogressive retrorse retroverse returnable reversible reversional reversionary revertible revulsionary temperamental