1.孩子的;孩子般的 Childish means relating to or typical of a child.
2.(尤指成年人)幼稚的,孩子气的 If you describe someone, especially an adult, as childish, you disapprove of them because they behave in an immature way.
childishly He hit back angrily, saying such remarks were childishly simplistic... 他愤怒地反击,说这些话太过幼稚。 He knew that he had behaved childishly. 他意识到自己的举动很不成熟。