Imagine standing on a quiet lakeshore at dawn—the water so still and transparent you can see pebbles, reeds, even the slow drift of minnows ten feet down. That’s 澄 (chéng): not just ‘clear’ as in ‘transparent glass’, but clear *in depth*, *in stillness*, *in moral purity*. It’s the clarity that comes after turbulence settles—not instant transparency, but the profound calm of sediment sinking and light penetrating all the way to the bottom.

Grammatically, 澄 is almost always used in compound words (like 澄清 or 澄澈) or as a verb meaning ‘to clarify’—especially abstract things: ideas, intentions, misunderstandings. You’d never say *‘the sky is chéng’*; instead, you’d say *‘tā bǎ wèntí chéngqīng le’* (他把问题澄清了)—‘He clarified the issue’. Note: it’s rarely standalone in speech, and never an adjective before nouns like ‘clear water’ (that’s 清水, qīng shuǐ). Learners often overuse it adjectivally or confuse it with simpler synonyms like 清.

Culturally, 澄 carries Daoist and Chan Buddhist resonance—it evokes the mind ‘clarified’ through meditation, like muddy water left undisturbed until it becomes lucid. In classical poetry, 澄 appears in lines describing both physical lakes and inner stillness (e.g., Wang Wei’s ‘澄江静如练’—‘The limpid river lies still as white silk’). Pronounced dèng only in rare surnames or archaic place names—ignore dèng unless your teacher calls roll in a Ming-dynasty village.