infantile

[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

infantility [in-fuhn-til-i-tee] , noun


1. puerile, immature, weak. See childish.


1. adult, mature.
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World English Dictionary
infantile (ˈɪnfənˌtaɪl)
 
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

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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
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Example sentences
But the next day, childlike wonder gives way to infantile greed.
The painted clown acted out childish behaviors and infantile pleasures.
Perhaps a better adjective than feminine is infantile.
Such an approach is infantile and has nothing to do with scholarship.
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