To become foggy or gloomy, or obscured from sight.

“The glass clouds when you breathe on it.”

To overspread or hide with a cloud or clouds.

“The sky is clouded.”

To make obscure.

“All this talk about human rights is clouding the real issue.”

Filled with clouds.

Unclear; surrounded in mystery.

Made dim or blurry.

“the clouded eyes of the sick man”