If you have no clothes on, you're naked. Likewise, things that are uncovered or unhidden, like a bare tree, are also naked.
Naked people are nude, and naked animals are missing their hair or fur. When piles of snow melt in the spring, they leave naked fields and sidewalks. If your white walls don't have any pictures or mirrors hanging on them, they'll look naked too. If you don't try to hide your sorrow, you'll show naked emotio. And, finally, to see without the aid of glasses or a microscope is called using "the naked eye."