say it: uhn-RIT-uhn
unwritten is an adjective meaning "based on custom rather than documentation". It carries 3 recorded senses.
based on custom rather than documentation
“an unwritten law”
“rites...so ancient that they well might have had their unwritten origins in Aurignacian times”
said or done without having been planned or written in advance
“he made a few ad-lib remarks”
Definitions, synonyms and semantic relations for unwritten come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.