Also found in: Medical.
Related to puerilism: Tyronism
puer·il·ism(pyo͝or′ə-lĭz′əm, pwĕr′ə-, pyo͞o′ər-ə-)
Childish behavior in an adult, especially as a symptom of mental illness.
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.
(Psychiatry) psychiatry immature or childish behaviour by an adult
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
pu•er•il•ism(ˈpyu ər əˌlɪz əm, ˈpyʊər ə-)
childishness in the behavior of an adult.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
a mental condition marked by childish or infantile behavior. — puerility, n.See also: Psychology
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.