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 (pyo͝or′īl′, pwĕr′-, pyo͞o′ər-, -əl)
1. Immature, especially in being silly or trivial; childish. See Synonyms at young.
2. Archaic Belonging to childhood; juvenile.

[Latin puerīlis, from puer, child, boy; see pau- in Indo-European roots.]

puer·ile·ly adv.
puer′il′i·ty (-ĭl′ĭ-tē), puer′ile·ness (-əl-nĭs, -īl-) n.
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References in periodicals archive ?
Of the Americans he seemed to he puerilely ignorant.
At times Williams's dialogue is puerilely trite ("Glory, you don't belong here"), but it can also be terrifyingly poetic: "Death's like a river.