| impulsive(adjective, natural, thoughtless, instinctive, automatic) |
| involuntary(adjective, passionate, violent, natural, instinctive) |
| spontaneous(adjective, natural, thoughtless, instinctive, automatic) |
| unpremeditated(adjective, passionate, violent, abrupt, instinctive) |
| unprompted(adjective, passionate, violent, abrupt, instinctive) |
| unthinking(adjective, natural, unconscious, instinctive, automatic) |
| accustomed(adjective, natural, instinctive, automatic, involuntary) |
| congenital(adjective, natural, instinctive, automatic, involuntary) |
| habitual(adjective, natural, unconscious, instinctive, automatic) |
| inborn(adjective, natural, instinctive, automatic, involuntary) |
| ingrained(adjective, natural, instinctive, automatic, involuntary) |
| inherent(adjective, natural, instinctive, automatic, involuntary) |
| innate(adjective, natural, instinctive, automatic, involuntary) |
| intrinsic(adjective, natural, instinctive, automatic, involuntary) |
| intuitional(adjective, natural, instinctive, automatic, involuntary) |
| intuitive(adjective, passionate, violent, natural, instinctive) |
| knee-jerk(adjective, natural, unconscious, instinctive, automatic) |
| mechanical(adjective, natural, instinctive, automatic, involuntary) |
| native(adjective, natural, instinctive, automatic, involuntary) |
| natural(adjective, unconscious, instinctive, automatic, involuntary) |