[in-fuhn-tl-iz-uhm, -tahy-liz-, in-fan-tl-iz-uhm]
the persistence in an adult of markedly childish anatomical, physiological, or psychological characteristics.
an infantile act, trait, etc., especially in an adult.
a speech disorder characterized by speech and voice patterns that are typical of very young children.

1890–95; infantile + -ism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
infantilism (ɪnˈfæntɪˌlɪzəm)
1.  psychol
 a.  a condition in which an older child or adult is mentally or physically undeveloped
 b.  isolated instances of infantile behaviour in mature persons
2.  childish speech; baby talk

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

infantilism in·fan·til·ism (ĭn'fən-tl-ĭz'əm, ĭn-fān'tl-)

  1. A state of arrested development in an adult, characterized by retention of infantile mentality, accompanied by stunted growth and sexual immaturity, and often by dwarfism.

  2. Extreme immaturity, as in behavior or character.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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