puerile /ˈpjɚrəl/ adjective Learner's definition of PUERILE
[more puerile; most puerile] formal + disapproving
: silly or childish especially in a way that shows a lack of seriousness or good judgment幼稚的；愚蠢的 -
a puerile comedy幼稚的喜剧
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puerile behavior愚蠢的行为