modified
innate, inborn, inbred, indigenous to, intrinsic, internal, original, native, deep-rooted, built-in, latent, implicit, ingrained, immanent, congenital, connate, fixed, indwelling, inseparable, inalienable, subjective, indispensable, essential, basic, hereditary, constitutional, natural, integral, integrated, in one's blood, bred in the bone, running in the family, in the grain, part and parcel of; see also native 1, natural 1.
Antonyms incidental*, extrinsic, superficial.