careless
US /ˈker.ləs/
UK /ˈker.ləs/

1.
descuidado, negligente, imprudente
not giving enough attention and thought to what you are doing, with the result that you make mistakes, damage things, or cause harm to someone
:
•
It was careless of him to leave the door unlocked.
Fue descuidado de su parte dejar la puerta sin llave.
•
He made a careless mistake on the exam.
Cometió un error descuidado en el examen.
2.
indiferente, despreocupado, desatento
not concerned or worried about something
:
•
She was careless of the consequences of her actions.
Ella era indiferente a las consecuencias de sus acciones.
•
He seemed completely careless about his future.
Parecía completamente indiferente a su futuro.