remorse

noun
re*morse \ ri-ˈmȯrs \
14th century{ds||1||}
  • a gnawing distress arising from a sense of guilt for past wrongs : self-reproach
  • compassion

buyer's remorse

noun
buyer's remorse \
1946
  • the unpleasant feeling of having made an unwise purchase

agonies of guilt/remorse/regret

phrase
agonies of guilt/remorse/regret \
  • feelings of guilt, remorse, or regret
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