Meaning: This sentence describes clouds moving or resting on the surface of the atmosphere in a relaxed or leisurely manner. It's a common observation about the behavior of clouds on a calm day.
Choice of Words: Clouds are visible masses of water droplets or ice crystals suspended in the atmosphere. Float is a verb that means to move or rest on the surface of a liquid without sinking. Lazily is an adverb that describes something as being done in a relaxed or leisurely manner.