Native.
Synonyms:
indigenous, innate, natal, natural, original.
Native denotes that which belongs to one by birth; natal that which pertains to the event of birth; natural denotes that which rests upon inherent qualities of character or being. We speak of one's native country, or of his natal day; of natural ability, native genius. Compare INHERENT; PRIMEVAL; RADICAL.
Antonyms:
acquired, alien, artificial, assumed, foreign, unnatural.