If you’re looking for a roommate and someone writes murderer under “occupation,” you should definitely keep looking. A murderer is a person who kills deliberately and without justification.
In some instances, killing a person is considered a just or valid action — in a war, a soldier who kills another soldier is not considered to be a murderer, and people who kill in self-defense, to save themselves, are also not murderers. Killing out of anger or for money or revenge is murder, and anyone who does it is a murderer. Charles Manson is in jail for being a murderer. The Old English root of murderer is morðor, "unlawful killing."
Definitions of murderer
a criminal who commits homicide (who performs the unlawful premeditated killing of another human being)
someone who causes the death of a person or animal
DISCLAIMER: These example sentences appear in various news sources and books to reflect the usage of the word ‘murderer'.
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