In a Nutshell: 浅 (qiǎn) is the direct opposite of
深 (shēn), which means “deep” or “dark”. Think of it as a word that describes surfaces. It starts with the literal idea of shallow water, but its meaning extends metaphorically. If a color isn't deep and rich, it's
浅 (qiǎn) (light). If knowledge or an idea doesn't have much depth, it's also
浅 (qiǎn) (simple, superficial). It's a key descriptor for both the physical and abstract worlds.