他是个年轻的家伙，没什么经验，很不成熟。

He was a young fellow, very green, very immature.

《柯林斯英汉双解大词典》

他说我们在感情上是不成熟的。

He said that we were emotionally immature.

《柯林斯英汉双解大词典》

弥尔顿是告诉我们他自己也还正在，渐渐成熟的过程中。

Milton is telling us that he is himself in the process, still in the process, of maturing.

youdao

Freud was--As you're pointing out, Freud was notorious for pointing, for suggesting that women were morally immature relative to men.

正如你刚才指出的，弗洛伊德因一个观点的提出而臭名远扬，他认为，与男性相比,女性在道德上是不成熟的。

耶鲁公开课 - 心理学导论课程节选

Milton is telling us that he is himself in the process, still in the process, of maturing.

弥尔顿是告诉我们他自己也还正在，渐渐成熟的过程中。

耶鲁公开课 - 弥尔顿课程节选