adj.1 trivial, childish, immature.
2 of or like a child.
Phrases and idioms:
puerile breathing breathing characterized by a loud pulmonary murmur as in children, a sign of disease in an adult.
Derivatives:
puerilely adv. puerility n. (pl. -ies).
Etymology: F pu{eacute}ril or L puerilis f. puer boy