Atavistic

1. (a.) Ancient; belonging to a past era; as, the reappearance on an atavistic trait in a species.

Thesaurus Entries

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