Fair and upright; open, honest, and impartial—acting with integrity and without bias.
彼は公明正大な審判として知られている。
He is known as an impartial and upright referee.
交渉は公明正大に進めるべきだ。
Negotiations should be conducted openly and fairly.
会社の採用基準は公明正大でなければならない。
The company's hiring criteria must be fair and impartial.