清純
せいじゅん · seijun · JLPT N1 · noun
innocence
💧 清 = clear, clean + 純 = pure, unmixed; together, clear and unmixed purity
清 means clear or clean, and 純 means pure or unmixed. Stacked together they describe something free of any impurity, which extends to the sense of innocence.
清 — water 氵 + 青 (azure/blue-green, phonetic)
清 is a semantic-phonetic compound. The water radical 氵 gives the meaning—originally clear, unmuddied water—while 青 (qīng, azure) supplies the sound and reinforces the image of pure blue-green water. The sense later broadened from 'clear water' to 'clear, pure, clean' in general.