“不成熟”的拼音为：bù chéng shú...

他还是个毛头小子，幼稚得很，一点都不成熟。He was a young lad, very green, very immature.他暗示我们情感上还不成熟。He implied that we were emotionally immature.他意识到自己的举动很不成熟。He knew that he had behaved childishly....

“不成熟”的英语可以翻译为：immature，juvenility ...