Synonyms for Unwritten (same or very similar meaning)
WordNet sense 1 (using speech rather than writing):
oralWordNet sense 2 (uttered through the medium of speech or characterized by speech; sometimes used in combination):
spokenWordNet sense 3 (said or done without having been planned or written in advance):
ad-lib, spontaneousWordNet sense 4 (not furnished with or using a script):
unscriptedFrom the ODE community, based on WordNetadd/edit