adjectival noun or quasi-adjective, noun

Messages.yoji.
  1. fair, just and upright, open and honest, aboveboard, honorable.

Variations

Pronunciation Kanji Kana Is Common
公明正大 こうめいせいだい

Contained Kanji Breakdown

public, prince, official
コウ おおやけ ク (2nd, N4)
eight, eight radical (no. 12)
ハチ や はっ (1st, N5)
I, myself, katakana mu radical (no. 28)
シ ボウ ム (Kentei 1)
bright, light
メイ あ.かり あきら (2nd, N4)
day, sun, Japan
ひ にっ ニチ (1st, N5)
month, moon
つき ゲツ ガツ (1st, N5)
correct, justice, righteous
セイ ショウ ただし (1st, N4)
one, one radical (no.1)
イチ いっ ひと- (1st, N5)
stop, halt
と.まる シ どめ (2nd, N4)
divining, fortune-telling, divination or katakana to radical (no. 25)
ボク うらな.う うらない (Kentei Pre-1)
large, big
ダイ おお- た (1st, N5)
one, one radical (no.1)
イチ いっ ひと- (1st, N5)
person
ひと ニン ジン (1st, N5)