noun
the state or quality of being childishly silly or immature
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The puerility of his behavior was evident in the way he refused to take responsibility for his actions.
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His puerility really showed when he started throwing a tantrum over not getting his favorite dessert.
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I can't believe the level of puerility he displayed when he started a fight over a video game.
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The puerility of their arguments was like watching children squabble over toys.