adj.無云的；晴朗的

The sky is quite blue and cloudless. 天空蔚藍(lán),明凈無云。

The sun shone brightly in a cloudless sky. 太陽在無云的天空中明亮地照耀著。

It's a cloudless day today. 今天天氣晴朗。

My friends and I went to the park together on a cloudless day. 在一個晴朗的天氣里，我和朋友們一起去公園。