This is the 9138th most frequent Japanese word.
無邪気
Innocence or naivety.
In this sentence, '無邪気' (innocent) describes her smile, indicating its pure and unaffected nature.
彼女の無邪気な笑顔が、皆を幸せな気分にしました。
Her innocent smile made everyone feel happy.
Here, '無邪気' refers to the children's nature while playing, emphasizing their carefree and natural behavior.
子供たちは無邪気に遊んでいます。
The children are playing with innocence.
In this sentence, '無邪気' characterizes the question as being genuine and devoid of malice, showing simple curiosity.