in·fan·tile

[in-fuhn-tahyl, -til]
adjective
1.
characteristic of or befitting an infant; babyish; childish: infantile behavior.
2.
of or pertaining to infants or infancy: infantile diseases.
3.
Physical Geography, youthful ( def 5 ).

Origin:
1690–1700; < Latin infantīlis. See infant, -ile

in·fan·til·i·ty [in-fuhn-til-i-tee] , noun


1. puerile, immature, weak. See childish.


1. adult, mature.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To infantile
00:10
Infantile is always a great word to know.
So is bezoar. Does it mean:
a chattering or flighty, light-headed person.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
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World English Dictionary
infantile (ˈɪnfənˌtaɪl) [Click for IPA pronunciation guide]
 
adj
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
 
infantility
 
n

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

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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Example sentences
They are the people you insulted with your infantile, self-serving swipes at a
  belief system you refuse to understand.
The movie executives seen here are infantile, self-involved and arrogant.
Your sense of humor is both infantile and potentially dangerous.
But the expulsion of infantile vomit is unique in a number of ways.
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