1. to respond to something in an automatic, natural way without conscious thought or deliberation
When the child saw the spider, she reacted instinctively and jumped back.
Quando a criança viu a aranha, ela reagiu instintivamente e saltou para trás.
2. to act based on innate impulse or intuition rather than reasoning
The experienced driver reacted instinctively to avoid the collision.
O motorista experiente reagiu instintivamente para evitar a colisão.