ふぶんりつ 不文律 Wanikani level 23 Play audio LinksSentence search for 不文律Sentence search for ふぶんりつKanji details for 不, 文 and 律Edit in JMdict Noun1. unwritten law; common lawLaw, See also 成文律Noun2. unwritten rule Discussions Log in to talk about this word.