(usually used in negative sentences) a feeling of regret for one's action

regret, sorrow

punishment which one imposes on oneself to show one is sorry

reparation for wrong

sorrow and regret (for doing wrong, sin)

shame, sorrow

the feeling of being sorry or unhappy at the loss of something; a disappointment or a sad event

upset over past action

a strong feeling of regret for doing wrong

guilty or bad conscience

to get/give little attention to a person because he or she does not deserve it

reparation for wrong

(a cause of) sadness or regret

extreme upset, grief