Descuido vs. negligencia vs. falta de cuidado vs. falta de atención

In Spanish, several terms capture the nuances of 'carelessness' and 'negligence'. Among them are 'descuido', 'negligencia', 'falta de cuidado', and 'falta de atención'. Each has distinct connotations and uses.

Descuido

'Descuido' refers to a lack of attention or care in specific instances, often resulting in an accidental oversight or minor mistake.
Dejé las llaves dentro del coche por un descuido.
(I left the keys inside the car by accident.)
El descuido en su trabajo le costó una amonestación.
(The oversight in his work cost him a reprimand.)

Negligencia

'Negligencia' is a stronger term, often implying a continuous or serious failure to act with due care. It is frequently used in legal and formal contexts.
Fue demandado por negligencia médica.
(He was sued for medical negligence.)
La negligencia en la seguridad del edificio causó varios accidentes.
(The negligence in building security caused several accidents.)

Falta de cuidado

'Falta de cuidado' means 'lack of care' and can be used in various contexts to describe general inattentiveness or failure to maintain something properly.
La falta de cuidado de la máquina resultó en su desgaste prematuro.
(The lack of care for the machine resulted in its premature wear.)
Su falta de cuidado al conducir es peligrosa.
(His lack of care while driving is dangerous.)

Falta de atención

'Falta de atención' translates to 'lack of attention' and generally refers to a broader spectrum of inattentiveness, either in behavior or focus. It can be momentary or ongoing.
Su nota baja fue debido a una falta de atención en clase.
(His low grade was due to a lack of attention in class.)
Tuvimos que repetir las instrucciones debido a su falta de atención.
(We had to repeat the instructions due to his lack of attention.)

Summary

While all these terms relate to inadequacies in care or attention, each has its unique context. 'Descuido' often implies an incidental oversight, 'negligencia' suggests serious and sometimes prosecutable neglect, 'falta de cuidado' points to general neglect or improper maintenance, and 'falta de atención' denotes inattentiveness or distraction.