puerilism

[ pyoo-er-uh-liz-uhm, pyoor-uh- ]
/ ˈpyu ər əˌlɪz əm, ˈpyʊər ə- /

noun Psychiatry.

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. 2020

British Dictionary definitions for puerilism

puerilism
/ (ˈpjʊərɪˌlɪzəm) /

noun

psychiatry immature or childish behaviour by an adult
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

Medical definitions for puerilism

puerilism
[ pyōōər-ə-lĭz′əm, pyurə- ]

n.

Childish behavior in an adult, especially as a symptom of mental illness.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.