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puerile (adj.)

1660s, "youthful, boyish," a back-formation from puerility (q.v.), or else from French puéril (15c.), from Latin puerilis "boyish; childish," from puer "boy, child." The depreciative sense of "merely juvenile, immature, lacking intellectual force" is from 1680s.

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Definitions of puerile from WordNet

puerile (adj.)
of or characteristic of a child;
puerile breathing
puerile (adj.)
displaying or suggesting a lack of maturity;
puerile jokes
Synonyms: adolescent / jejune / juvenile
From wordnet.princeton.edu