完ぺき
かんぺき · kanpeki · JLPT N1 · na-adj
perfection
💎 完 (complete) + 璧 (flawless jade disc) = kan-peki: wholly complete, no flaw
The kanji 璧 is a flat jade disc, valued for being free of flaws. Joined with 完 (complete), 完璧 means perfection. The kana ぺき is its reading.
完 — roof 宀 + yuán 元 (phonetic)
完 is a semantic-phonetic compound: the roof 宀 suggests a house or enclosure, while 元 supplies the sound 'yuán/wán'. Originally it meant a building that was intact or whole, and the sense broadened to 'complete, finish, whole'.