naivety
/nɑːˈiːvtɪ/(亦作naïvety)
noun
mass noun
1- lack of experience, wisdom, or judgement幼稚; 单纯：
his appalling naivety in going to the press.
他去求助新闻界的那种极端幼稚。
1.1
- innocence or unsophistication天真：
the charm and naivety of the early to mid fifties.
年过半百者的魅力和天真。
词源
late 17th cent.: from French naïveté, from naïf, -ive （see NAIVE）.