or LingchiDefinition given by Wikipedia: Lingchi (凌遲), variously translated as the slow process, the slow death, or the slow slicing, and also known as death by a thousand cuts, was a form of torture and execution used in China from around 900 until it was banned in 1905.
It was also used in Vietnam and Korea. In this form of execution, a knife was used to methodically remove portions of the body over a long period of time, until death occurred.
Imagine being tied up or tied to a post, still very much alive, then a guy with a knife starts cutting chunks of flesh from your skin, slowly and surely, you feel the pain, but all the while, you are alive while the executioner makes sure you live as long as possible, then finally you die after a long period of time.
While the pain is not the worst compared to other punishments, the time spent suffering in such pain certainly is, since unlike other punishments, the extreme pain lasts for a very long time