她不顾后果的冒险行为让家人非常担心。

Her ___reckless behavior of taking unnecessary risks worried her family deeply.

他鲁莽驾驶导致了严重的车祸。

His ___reckless driving caused a serious accident.

酒后驾驶是极其鲁莽的行为。

Driving after drinking is extremely ___reckless behavior.