adjective
not written or recorded
adverb
in a manner that is not written or recorded
-
The unwritten rules of etiquette dictate that you should always RSVP to a formal event.
-
There are some unwritten rules about borrowing your friend's clothes without asking.
-
I didn't know there were so many unwritten rules about how to act at a party.
-
The unwritten promises between them were just as important as the ones on paper.