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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
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. 2014.
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British Dictionary definitions for infantility

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
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Word Origin and History for infantility

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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infantility 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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