unavenged
/ʌnəˈvɛndʒd
/adjective
(Of a person, injury, or wrong) not avenged: these murders should not be allowed to go unavenged...
- The Crown Forces decided these murders would not be allowed to go unavenged.
- For some, Tuesday's attack marks a single reprisal for more than a decade of attacks that have gone unavenged.
- No good turn will be forgotten, Joe, and no transgression unavenged.