• 潔いさぎよい — clean; upright; fair
• 清潔せいけつ — cleanliness; hygienic
• 不潔ふけつ — unclean; unsanitary
• 潔白けっぱく — innocence; purity
• 簡潔かんけつ — brevity; conciseness

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潔 is a 形声けいせい character: the radical 氵(さんずい) gives the idea of water/cleansing, and 絜ケツ serves as the phonetic, pointing to the reading ケツ and the sense of “pure/clean.” From literal “washing clean,” it extends to moral uprightness and fair, decisive attitude (e.g., 潔く認める).

彼は 敗北はいぼくを 潔いさぎよく 認みとめた。
He admitted defeat with admirable fairness.

この報告ほうこくは 簡潔かんけつで、要点ようてんが 明確めいかくだ。
This report is concise and makes the key points clear.