What is another word for un-written?
Pronunciation: [ˈʌnɹˈɪtən] (IPA) 
There are several synonyms for the word "un-written," which means something that has not been written down or recorded. Some possible alternatives include unrecorded, unrecorded, unregistered, unwritten, unnoticed, and unenforced. Each of these words describes something that has not been documented or recorded in some way, whether that's a law or regulation that hasn't been enforced, an idea that hasn't been put down on paper, or a conversation that hasn't been documented. Other possibilities could include unsaid, unexpressed, or uncommunicated. These words all speak to something that hasn't been put into words or presented in a tangible way.
