"Unbekannt" in English means "unknown".
It can be used in various contexts:
* Person: "The assailant is still unbekannt." (The assailant is still unknown.)
* Place: "The location of the treasure remains unbekannt." (The location of the treasure remains unknown.)
* Fact: "The cause of the explosion is unbekannt." (The cause of the explosion is unknown.)
Let me know if you have any other German words you'd like translated!