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Puerile, adj.

Pronunciation: ˈpyo͝orəl, ˈpyo͝orˌīl

Meaning: This word refers to things that are childishly silly and trivial. When someone is being puerile, they are demonstrating a lack of maturity, seriousness, or good judgment. Think infantile, juvenile, inane, etc.

Usage:

• The argument, as currently presented, betrays a rather puerile tint that doesn’t camouflage its sophomoric underpinnings.
• Concert organizers branded the group’s actions as puerile.
• Such childish antics and puerile reasoning are endangering sponsorship at the very moment when the arts most need it.