Third degreeing is a term that refers to the act of questioning someone relentlessly or harshly. It's often used in the context of police investigations or interrogations. However, there are many other words and phrases that can be used to describe this type of questioning. Some synonyms for third degreeing include grilling, cross-examining, drilling, pressing, and peppering. These words all suggest a persistent and aggressive style of questioning, intended to extract information or a confession from someone. Using synonyms for third degreeing can add variety and nuance to your writing, and help to convey a particular tone or mood.