offender

Etymology

From Anglo-Norman offendour.

noun

1. One who gives or causes offense, or does something wrong.
   Almost all down trains are late, however; the empty wagon trains are probably the worst offenders and one or two hours' late running by them is not unusual. 1961 March, Warren Smith, “The problems of train regulation - a study of operation at Trent”, in Trains Illustrated, page 169
2. A person who commits an offense against the law, a lawbreaker.