adverb, takes genitive case の

  1. behind closed doors, behind-the-scenes, (under the veil of) secrecy.

Variations

Pronunciation Kanji Kana Is Common
秘密裡 ひみつり
秘密裏 ひみつり

Contained Kanji Breakdown

secret, conceal
ヒ ひ.める ひそ.か (6th, N1)
two-branch tree radical (no. 115)
カ いね (Kentei Pre-1)
katakana no radical (no. 4)
ヘツ えい よう (Kentei 1)
tree, wood
き モク こ- (1st, N5)
invariably, certain, inevitable
ヒツ かなら.ず (4th, N3)
heart, mind, spirit
こころ シン (2nd, N4)
secrecy, density (pop), minuteness
ミツ ひそ.か (6th, N1)
quiet, silent, in good health
ミチ フク ヒツ
shaped crown, katakana u radical (no. 40)
ベン メン (Kentei 1)
dot, tick or dot radical (no. 3)
チュ (Kentei 1)
wa-shaped crown radical (no. 14)
ベキ (Kentei 1)
invariably, certain, inevitable
ヒツ かなら.ず (4th, N3)
heart, mind, spirit
こころ シン (2nd, N4)
katakana no radical (no. 4)
ヘツ えい よう (Kentei 1)
mountain
やま サン セン (1st, N5)
reverse, inside, palm
うら リ うち (Kentei Pre-1)
clothes, clothing radical (no. 145
ころも
ri, village, parent's home
さと リ さ (2nd)
rice field, rice paddy
た デン たん (1st, N4)
soil, earth, ground
ド つち は (1st, N5)