KUN is one of the HONORIFICS Japanese people are used to address to each other. Others are 'san', 'chan', 'sama'. [ 1] Kun (君) is the informal address for males, such as boys or juniors at work. It can be used by someone who is superior, males of the same age and status and in addressing male children. hon·or·if·ic /ˌänəˈrifik/ a title or word implying or expressing high status, politeness, or respect.