third-degree

Short definition from Wiktionary

Adjective

1. 1
   At the third level of some system: The least severe level of felony, typically involving a lack of planning and/or the presence of various mitigating factors.
2. 2
   At the third level of some system: An extremely severe level of damage, typically involving major scarring and damage to subcutaneous tissue as well as the epidermis.

Noun

1. 1
   Intensive rough interrogation in order to extract information or a confession