dereliction
/ˌderəˈlɪkʃən/
noun
formal
[noncount] the act of no longer caring for, using, or doing something :the act of abandoning something
the condition of being no longer cared for
[singular] law :failure to do your job or duty :failure to do what you should do
Dereliction is usually used to refer to the crime that is committed when a military officer or police officer fails to do an important part of his or her job.