| inherent(adjective, characteristic, start, natural, individual) |
| innate(adjective, characteristic, start, natural, individual) |
| inborn(adjective, characteristic, start, natural, individual) |
| intrinsic(adjective, characteristic, start, natural, fixed) |
| congenital(adjective, start, natural, instinctive, be) |
| natural(adjective, start, inside, instinctive, be) |
| rooted(verb, adjective, impulse, inside, instinctive) |
| inbred(adjective, characteristic, start, natural, individual) |
| deep-rooted(adjective, set, complete, continue, true) |
| deep-seated(adjective, characteristic, complete, continue, true) |
| native(adjective, characteristic, start, natural, individual) |
| habitual(adjective, usual, established, inside, lasting) |
| intuitive(adjective, natural, instinctive, automatic, reflex) |
| visceral(adjective, natural, secret, private, primitive) |
| fundamental(adjective, intrinsicality, intrinsic, inborn) |
| instinctual(adjective, inside, instinctive, interior, automatic) |
| intuitional(adjective, inside, instinctive, interior, automatic) |
| inveterate(adjective, set, complete, continue, fixed) |
| second-nature(adjective, inside, instinctive, interior, automatic) |
| accustomed(adjective, set, fixed, instinctive, automatic) |