noun, na-adjective, noun which may take the genitive case particle 'no'
upright and clean-handed; pure in heart and with a clean conscience
A yojijukugo describing a person of impeccable integrity, free from any moral stain or corruption. Often used in formal or literary contexts to praise character.
He is a person of unimpeachable integrity, trusted by everyone.
清浄潔白の精神で公務に当たる。
He carries out his public duties with a pure and honest spirit.
Very similar in meaning, but 清廉潔白 is more common and emphasizes honesty and incorruptibility, while 清浄潔白 adds a nuance of purity and cleanliness of heart.
A yojijukugo composed of 清浄 (purity, cleanliness) and 潔白 (innocence, purity). The exact historical derivation is uncertain, but the combination reinforces the idea of moral and spiritual purity.