轻松 (qīng sōng) is an adjective meaning 'relaxed' or 'carefree' — describing a state of mental or physical ease, free from stress, tension, or burden. The first character 轻 (qīng) literally means 'light' (as in weight), and the second 松 (sōng) means 'loose' or 'slack' (as in relaxed muscles or an unclenched grip). Together, they form a vivid image: something that feels light *and* loose — hence emotionally unburdened and at ease. It’s commonly used to describe moods, atmospheres, tasks, conversations, or even music or reading material.

This word often appears in everyday speech and writing to express relief after difficulty, comfort in familiar company, or the pleasant simplicity of an activity. It can modify nouns (e.g., 轻松的音乐 — 'relaxing music') or serve as a predicate (e.g., 他看起来很轻松 — 'He looks relaxed'). Unlike formal synonyms like 恬淡 (tián dàn), 轻松 is neutral-to-informal and widely appropriate across ages and settings.