1. to make a decision or choice in a hasty, careless, or irresponsible manner without proper consideration of consequences
He decided recklessly to quit his job without having another one lined up.
Ele decidiu imprudentemente deixar seu emprego sem ter outro já garantido.
2. to choose a course of action without adequate thought or deliberation
They decided recklessly to invest all their savings in a risky venture.
Eles decidiram imprudentemente investir todas as suas economias em um empreendimento arriscado.