takes genitive case の, adverb, noun

  1. private, confidential, informal, secret, (within the) family circle, (on the) inside.

Variations

Pronunciation Kanji Kana Is Common
内々 うちうち
内々 ないない
内内 うちうち
内内 ないない

Contained Kanji Breakdown

inside, within, between
ナイ うち ダイ (2nd, N3)
upside-down box radical (no. 13)
キョウ ケイ (Kentei 1)
person
ひと ニン ジン (1st, N5)
repeated kanji symbol