immature
adjective uk/ˌɪm.əˈtʃʊər/ us/ˌɪm.əˈtʊr/
C2 disapproving不成熟的
not behaving in a way that is as calm and wise as people expect from someone of your age
Stop being so silly and immature, Chris! 克里斯，不要这么愚蠢幼稚！
She's rather immature for her age, don't you think? 她都这么大了，你不觉得她显得相当幼稚吗？
disapproving没经验的
not having much experience of something
politically immature 政治上不成熟
biology specialized未长成的，发育未全的
not yet completely grown or developed
While the animals are still immature, they do not breed. 动物发育未全时不会生育。