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puerilism

[pyoo-er-uh-liz-uh m, pyoo r-uh-]
noun Psychiatry.
  1. childishness in the behavior of an adult.
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Origin of puerilism

First recorded in 1920–25; puerile + -ism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for puerilism

puerilism

noun
  1. psychiatry immature or childish behaviour by an adult
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

puerilism in Medicine

puerilism

(pyōōər-ə-lĭz′əm, pyurə-)
n.
  1. Childish behavior in an adult, especially as a symptom of mental illness.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.