| connate(adjective, characteristic, natural, essential, basic) |
| normal(adjective, ordinary, natural, instinctive, automatic) |
| visceral(adjective, natural, primitive, instinctive, automatic) |
| essential(adjective, reasonable, natural, basic, fundamental) |
| regular(adjective, ordinary, natural, instinctive, automatic) |
| built-in(adjective, start, be, native, included) |
| connatural(adjective, start, complete, reasonable, ordinary) |
| indwelling(adjective, start, be, native, inborn) |
| instinctive(adjective, reasonable, ordinary, natural, automatic) |
| reflex(adjective, natural, inside, interior, automatic) |
| unlearned(adjective, natural, instinctive, automatic, inherent) |
| automatic(adjective, natural, inside, interior, within) |
| fundamental(adjective, intrinsicality, inborn) |
| impulsive(adjective, natural, instinctive, automatic, involuntary) |
| involuntary(adjective, reasonable, ordinary, instinctive, automatic) |
| mechanical(adjective, natural, instinctive, automatic, inherent) |
| spontaneous(adjective, reasonable, ordinary, instinctive, automatic) |
| typical(adjective, ordinary, natural, instinctive, automatic) |
| unmeditated(adjective, natural, instinctive, automatic, involuntary) |
| unpremeditated(adjective, natural, instinctive, automatic, involuntary) |