regressive
aboriginal
ancestral
antepatriarchal
atavic
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
atavism
atavist
action-movie
animalistic
anti-foreign
anticipatory
bone-deep
deep-seated
fight-or-flight
homicidal
ideas
ill-concealed
ingrained
irrational
knee-jerk
long-forgotten
premonitory
sadistic
subconscious
uncontrollable
unreasoned
unreasoning
visceral