As an adjective describing a person's behavior:
* The reckless driver sped through the red light, narrowly avoiding an accident.
* Her reckless spending habits left her deeply in debt.
* His reckless disregard for safety led to a serious injury.
As an adjective describing an action or behavior:
* The reckless attack on the city caused widespread damage.
* The company's reckless investments resulted in huge losses.
* His reckless pursuit of fame landed him in trouble with the law.
As an adverb describing an action:
* She recklessly threw herself into the dangerous situation.
* The soldiers recklessly charged into battle.
* They recklessly spent all their savings on a new car.
In a figurative sense:
* Her reckless abandon on the dance floor was infectious.
* He spoke with reckless abandon, revealing secrets he shouldn't have.
Remember, "reckless" often has a negative connotation, suggesting a lack of care for consequences or safety.