幼稚

他太幼稚了，不懂得如何与人相处。

tā tài yòuzhì le, bù dǒng dé rúhé yǔ rén xiécháng.

He is too naive to know how to get along with others.

这个计划太幼稚了，根本行不通。

zhè ge huànyìng tài yòuzhì le, běnggãng xíng bù tōng.

This plan is too naive and won't work.