Wiktionary
congenital insensitivity to pain
n. (context disease English) A rare inborn disorder, the sufferers of which can not feel pain.
Wikipedia
Congenital insensitivity to pain
Congenital insensitivity to pain (CIP), also known as congenital analgesia, is one or more rare conditions in which a person cannot feel (and has never felt) physical pain. The conditions described here are separate from the HSAN group of disorders, which have more specific signs and etiology. It is an extremely dangerous condition.