うちうち 内々 Common word LinksSentence search for 内々Sentence search for うちうちSentence search for ないないSentence search for 内内Kanji details for 内Edit in JMdict Noun which may take the genitive case particle 'no', Adverb (fukushi), Noun1. private; confidential; informal; secret; (within the) family circle; (on the) insideOther forms内々 【ないない】、内内 【うちうち】、内内 【ないない】 Discussions Log in to talk about this word.