naive

/naɪiv/

marked by or showing unaffected simplicity and lack of guile or worldly experience

中文释义：天真的；幼稚的

It was naive of him to believe that everyone would keep their promise.

他相信每个人都会遵守诺言，这太天真了。

The plan seems naive and unrealistic in the current economic climate.

在当前经济环境下，这个计划显得幼稚且不切实际。