clear and bright; limpid; lucid
Literary word describing something transparently clear and luminous, such as water, air, light, or a state of mind. Often used in poetic or refined contexts.
The moon was reflected on the limpid surface of the lake.
His mind was clear and bright, without a single cloud.
Compound of 澄 (clear, limpid) and 明 (bright, light). The exact historical derivation is uncertain, but the combination naturally conveys clarity and luminosity.