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infantile

[in-fuh n-tahyl, -til] /ˈɪn fənˌtaɪl, -tɪl/
adjective
1.
characteristic of or befitting an infant; babyish; childish:
infantile behavior.
2.
of or relating to infants or infancy:
infantile diseases.
3.
Physical Geography, youthful (def 5).
Origin of infantile
1690-1700
1690-1700; < Latin infantīlis. See infant, -ile
Related forms
infantility
[in-fuh n-til-i-tee] /ˌɪn fənˈtɪl ɪ ti/ (Show IPA),
noun
Synonyms
1. puerile, immature, weak. See childish.
Antonyms
1. adult, mature.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for infantile
Contemporary Examples
Historical Examples
  • He called this phenomenon of reactivation or secondary exaggeration of infantile reminiscences "regression."

  • infantile paradoxy is, however, very different to senile paradoxy.

    The Sexual Question August Forel
  • It is in Northern Syria that its rudest and most infantile attempts have been found.

    The Hittites A. H. Sayce
  • It is infantile paralysis, a disease common with delicate children.

    The Book of Khalid Ameen Rihani
  • infantile paradoxy must not be confounded with certain forms of masturbation, to which we shall return.

    The Sexual Question August Forel
  • First that infantile, inexcusable business of the shutters, and now this!

    The Moon is Green Fritz Reuter Leiber
  • This last consideration is one of very great importance, and I hope will not be much longer overlooked in infantile education.

    The Young Mother William A. Alcott
British Dictionary definitions for infantile

infantile

/ˈɪnfənˌtaɪl/
adjective
1.
like a child in action or behaviour; childishly immature; puerile
2.
of, relating to, or characteristic of infants or infancy
3.
in an early stage of development
Derived Forms
infantility (ˌɪnfənˈtɪlɪtɪ) noun
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
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Word Origin and History for infantile
adj.

mid-15c., "pertaining to infants," from Latin infantilis "pertaining to an infant," from infans (see infant). Sense of "infant-like" is from 1772.

Online Etymology Dictionary, © 2010 Douglas Harper
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infantile in Medicine

infantile in·fan·tile (ĭn'fən-tīl', -tĭl)
adj.

  1. Of or relating to infants or infancy.

  2. Displaying or suggesting a lack of maturity; extremely childish.

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