| inborn(adjective, characteristic, start, natural, fixed) |
| inherent(adjective, characteristic, start, natural, fixed) |
| innate(adjective, characteristic, start, natural, fixed) |
| intrinsic(adjective, characteristic, start, natural, fixed) |
| inbred(adjective, characteristic, start, natural, fixed) |
| ingrained(adjective, characteristic, start, natural, fixed) |
| congenital(adjective, start, be, native, inborn) |
| essential(adjective, characteristic, natural, basic, intimate) |
| internal(adjective, characteristic, natural, essential, intimate) |
| native(adjective, start, be, native) |
| constitutional(adjective, start, be, native) |
| deep-seated(adjective, characteristic, natural, fixed, essential) |
| elemental(adjective, start, essential, basic, intimate) |
| immanent(adjective, native) |
| immediate(adjective, intimate, secret, private, penetrating) |
| secret(adjective, intimate, private, penetrating, personal) |
| built-in(adjective, start, be, native, included) |
| thorough(adjective, intimate, secret, private, penetrating) |
| connate |
| deep(adjective, intimate, secret, private, penetrating) |