A child who has been convicted of a criminal offense.

One who commits a status offense; especially a juvenile delinquent taken into state care for uncontrollable behavior at home.

A person who has previously offended against the law, often someone who may be deemed incorrigible. / One who performs a specific (often undesirable) action on multiple occasions.

Alternative form of repeat offender

(law) A juvenile offender whose crime is sufficiently serious that they can be sentenced as an adult.