1. A natural inclination or predisposition to act or behave in a certain way without conscious control or deliberate intention
His involuntary tendency to fidget during presentations was a source of embarrassment.
Sua tendência involuntária de se mexer durante apresentações era uma fonte de constrangimento.
2. An automatic or reflexive inclination that occurs without willful decision-making
The involuntary tendency to blink protects our eyes from harm.
A tendência involuntária de piscar protege nossos olhos de danos.