behaviour that is not as calm and wise as people expect from someone of your age

emotional immaturity 情感上的不成熟

He faced looming middle age with selfish immaturity. 他以一种自私的不成熟应对即将到来的中年。

the fact of not having much experience of something

The minister’s bad temper and political immaturity brought one disaster after another. 部长的坏脾气和政治上的不成熟导致了一场又一场的灾难。

His piano performance showed playing of disturbing immaturity. 他的钢琴演奏表现出令人不安的经验不足。

the state of being not yet completely grown or developed

physical immaturity 体格上的不成熟

The crying of an infant points to neurological immaturity, not bad parenting. 婴儿啼哭是因为他们神经系统发育不全，不是因为父母不合格。