Limpid means clear, like clean water you can see straight through. A limpid pool, limpid air, limpid eyes — nothing cloudy sits in the way. Writers also use it for language and thought: limpid prose is writing you can see through; you are not fighting the words. It is a rather formal, bookish word. In everyday talk people more often say clear or transparent. Though actually, it has nothing to do with limp, even though the first letters match. Limpid is about light getting through; limp is about something that will not stand up.

清澈的；澄澈的（偏書面；用來形容水、空氣，或文章清楚好懂）