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