The phrase "unpunished killing" refers to a crime where a person has been killed but the perpetrator has not faced any punishment for their action. Some synonyms for this phrase include "unforgiven homicide," "unresolved murder," "unavenged death," "unpunished slaughter," and "unprosecuted assassination." All of these phrases indicate that a person has been killed, but justice has not been served. Such unaccounted for crimes can leave a lasting impact on the victim's family and friends, who are left with a sense of loss and injustice. Advocating for the punishment of those who commit such crimes is essential for ensuring peace and justice in society.