What characteristic best defines a "recidivist"?

A recidivist is best defined as someone who repeatedly commits offenses after having already been punished for previous crimes. This term is commonly used in the context of criminal justice and refers to individuals who exhibit a pattern of offending behavior, often involving crimes of a similar nature. The essence of being a recidivist lies in the habitual nature of their offenses, reflecting a failure to reform despite previous interventions by the legal system.

This definition aligns with the concept that recidivists are not merely occasional offenders nor do they represent citizens who typically abide by the law. Additionally, a witness in a trial does not pertain to the characteristics of a recidivist, as this role involves providing testimony about events rather than engaging in criminal behavior. Therefore, the focus on habitual offenses clearly identifies the nature of a recidivist, making it the most precise option in the context of the question.