childishness
n. 童心;幼稚
例句
I can't stand for your childishness.
我受不了你的孩子气了。
Your humor, impishness and childishness gave me great impressions.
你的幽默,调皮,童心给我留下了很深的印象。
This is the " childishness " nature .
这就是“童心”的本质。