| habitual(adjective, inside, lasting, instinctive, automatic) |
| knee-jerk(adjective, inside, instinctive, interior, automatic) |
| rooted(adjective, inside, instinctive, interior, automatic) |
| second-nature(adjective, inside, instinctive, interior, automatic) |
| indigenous(adjective, start, complete, reasonable, ordinary) |
| normal(adjective, characteristic, reasonable, common, ordinary) |
| connate(adjective, characteristic, natural, essential, basic) |
| elemental(adjective, characteristic, start, complete, essential) |
| instinctive(adjective, characteristic, reasonable, physical, common) |
| fundamental(adjective, native, intrinsicality) |
| unlearned(adjective, natural, instinctive, automatic, inherent) |
| internal(adjective, characteristic, natural, essential, intimate) |
| reflex(adjective, natural, inside, interior, automatic) |
| regular(adjective, characteristic, reasonable, common, ordinary) |
| typical(adjective, characteristic, reasonable, common, ordinary) |
| automatic(adjective, natural, inside, interior, within) |
| impulsive(adjective, natural, instinctive, automatic, involuntary) |
| involuntary(adjective, reasonable, ordinary, instinctive, automatic) |
| mechanical(adjective, natural, instinctive, automatic, inherent) |
| spontaneous(adjective, reasonable, ordinary, instinctive, automatic) |