In Korean, "unnie" (언니) means "older sister" and is used by a younger female to address an older female who is not related to them. It can be used to refer to actual sisters, family members, or older female friends. The pronunciation of "unnie" is exactly how its spelled. The most common way to write "unnie" in romanized English is "unnie," but it can also be written as "eonni," "oni," or "uni". It is important to note that "unnie" is only used by women and only when addressing older female siblings or females with whom they are very close.