WordNet sense 1 (a person who was born in a particular place; an indigenous person):

indigen, indigene

WordNet sense 2 (free of extraneous elements of any kind):

pure

WordNet sense 3 (characteristic of or relating to people inhabiting a region from the beginning):

aboriginal

WordNet sense 4 (originating where it is found):

endemic, indigenous, autochthonous

WordNet sense 5 (normally existing at birth):

inborn