Instinctive; occurring naturally from instinct rather than from reason or learned behavior.
猫は危険を感じると本能的に逃げる。
A cat instinctively flees when it senses danger.
彼の本能的な判断が、危機を回避するのに役立った。
His instinctive judgment helped avoid the crisis.
親は本能的に子どもを守ろうとするものだ。
Parents naturally try to protect their children by instinct.