坦然
tǎn rán · HSK 7
calm
🛏️ 坦 = flat/level + 然 = -ly state suffix; a level state of mind = calm
坦 means flat, level, or open (as in 坦白 frank); 然 turns it into a manner or state. Level-and-steady, nothing sticking up to disturb you: calm and undisturbed.