Childish; trifling; silly.
1850, Thomas De Quincey, French and English Manners (originally published in Hogg's Instructor The French have been notorious through generations for their puerile affectation of Roman forms, models, and historic precedents.
Characteristic of, or pertaining to, a boy or boys; .
From Latin puerīlis (“childish”), from puer (“child, boy”).
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