| inborn(adjective, characteristic, start, natural, individual) |
| innate(adjective, characteristic, start, natural, individual) |
| intrinsic(adjective, characteristic, start, natural, fixed) |
| inherent(adjective, characteristic, start, natural, individual) |
| congenital(adjective, characteristic, start, natural, fixed) |
| essential(adjective, characteristic, natural, individual, basic) |
| ingrained(adjective, characteristic, start, natural, individual) |
| native(adjective, characteristic, start, natural, individual) |
| constitutional(adjective, characteristic, start, natural, fixed) |
| deep-seated(adjective, characteristic, natural, fixed, persistent) |
| indigenous(adjective, start, be, native, intrinsicality) |
| natural(adjective, start, be, native, intrinsicality) |
| connatural(adjective, start, be, native, innate) |
| instinctive(adjective, inherent, intrinsicality) |
| indwelling(adjective, characteristic, start, natural, fixed) |
| hereditary(adjective, intrinsicality, inherited) |
| connate(adjective, characteristic, natural, essential, basic) |
| inherited(adjective, intrinsicality) |
| elemental(adjective, characteristic, start, complete, essential) |
| internal(adjective, characteristic, natural, essential, intimate) |