adj. 25B6; adjective TACIT, implicit, unvoiced, taken for granted, accepted, recognized, understood; traditional, customary, conventional; oral, verbal, spoken, vocal, word-of-mouth.
UNWRITTEN
Meaning of UNWRITTEN in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012