無邪気

子供たちの無邪気な笑顔に心が和んだ。

The children's innocent smiles put me at ease.

彼女は子犬と無邪気に遊んでいる。

She is playing innocently with the puppy.

彼の言葉を無邪気に信じてしまった。

I naively believed what he said.

その無邪気さが彼の魅力だ。

His innocence is what makes him charming.