• 完了かんりょう — completion
• 完全かんぜん — perfection
• 完結かんけつ — conclusion
• 完備かんび — fully equipped
• 未完みかん — unfinished
• 完走かんそう — finishing a race

The character 完 pairs 宀 (“roof”) with 元 (“origin/base”), suggesting something safely enclosed and whole. It conveys the sense of being finished without defect—“complete” or “perfect.”