naked

The baby was splashing around in the small plastic bathtub, completely naked.

(Chinese) 那个小宝宝赤身裸体地在塑料小浴缸里玩水。

In some ancient Olympic games, athletes used to compete while being entirely naked.

(Chinese) 在一些古代奥林匹克运动会中，运动员们过去通常是全身赤裸地进行比赛。