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puer·ile(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.
puer′il′i·ty (-ĭl′ĭ-tē), puer′ile·ness (-əl-nĭs, -īl-) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.