Childishness
01
子供っぽさ, 幼稚さ
the behavior of being immature, overly playful, or exhibiting traits typically associated with children
例
His childishness made it difficult for others to take him seriously at work.
彼の子供っぽさは、職場で彼を真剣に受け止めることを他の人々にとって困難にした。
