Remordimiento vs. arrepentimiento
While both remordimiento and arrepentimiento relate to the English concepts of regret, remorse, or repentance, they are not interchangeable in Spanish. The key difference lies in the depth of the feeling and the subsequent desire for change.
Remordimiento
B2Remordimiento is the persistent, nagging feeling of guilt or unease that follows a wrongful act. The word comes from re (again) and morder (to bite), so it literally means to bite again. It describes the sting of a guilty conscience, a passive feeling focused on the negative emotion itself, which does not necessarily lead to a change in behavior.
Sintió un fuerte remordimiento por haberle gritado a su madre.
(He felt strong remorse for having yelled at his mother.)
El remordimiento no lo dejaba dormir por las noches.
(Remorse wouldn't let him sleep at night.)
Aunque tenía remordimientos, era demasiado orgulloso para pedir perdón.
(Although he had remorse, he was too proud to ask for forgiveness.)
El ladrón vivió con el remordimiento de su crimen por el resto de su vida.
(The thief lived with the remorse of his crime for the rest of his life.)
Un vago remordimiento le decía que no había actuado bien.
(A vague feeling of remorse told him that he had not acted correctly.)
Arrepentimiento
B1Arrepentimiento is a deeper and more active form of regret. It involves not only feeling sorry but also consciously recognizing the wrongdoing, wishing to have acted differently, and having a sincere desire to change or make amends. It implies a change of heart and mind, often leading to action.
Mostró su arrepentimiento al disculparse y devolver el dinero.
(He showed his repentance by apologizing and returning the money.)
El arrepentimiento genuino implica un cambio de conducta.
(Genuine repentance implies a change in behavior.)
En su carta, expresaba un profundo arrepentimiento por el dolor que había causado.
(In his letter, he expressed deep repentance for the pain he had caused.)
El juez tuvo en cuenta el arrepentimiento del acusado para reducir la sentencia.
(The judge took the defendant's repentance into account to reduce the sentence.)
Su mayor arrepentimiento en la vida fue no haber estudiado una carrera.
(His biggest regret in life was not having pursued a college degree.)
Summary
In short, remordimiento is the passive sting of a guilty conscience, a nagging feeling about a past mistake. Arrepentimiento is an active process of regret that includes recognizing the error and having a genuine desire to change, atone, or act differently in the future. You can feel remordimiento without ever changing, but arrepentimiento is the very foundation of change.