澹

A phono-semantic compound composed of:

水 (氵) — semantic component meaning “water”; 詹 — phonetic component indicating the sound (담 / dàn). The character originally described calm, still water, which led to meanings such as clarity and emotional calmness.
Semantic development: - calm, still water; - clear and tranquil; - emotional calmness or indifference.

담박 (澹泊) — simple and unworldly; free from greed

담연 (澹然) — calm; composed

澹 often appears in classical texts to describe an ideal state of mind: peaceful, detached, and free from desire.

It is less common in everyday usage compared to similar characters like 淡, but carries a more refined and literary nuance.
Related characters: 淡 — light; faint; indifferent

清 — clear; pure

靜 — quiet; calm