na-adjective
instinctive; instinctual
Describes actions, reactions, or feelings that arise from instinct rather than conscious thought.
危険を感じて本能的に後ろに飛びのいた。
Sensing danger, I instinctively jumped back.
彼の反応は本能的で、考える余
His reaction was instinctive; he had no time to think.