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From The Collaborative International Dictionary of English v.0.48:
Puerile \Pu"er*ile\, a. [L. puerilis, fr. puer a child, a boy: cf. F. pu['e]ril.] Boyish; childish; trifling; silly. [1913 Webster] The French have been notorious through generations for their puerile affectation of Roman forms, models, and historic precedents. --De Quincey. [1913 Webster] Syn: Youthful; boyish; juvenile; childish; trifling; weak. See Youthful. [1913 Webster]