Dictionary.com
definitions
  • synonyms

infantile

[in-fuh n-tahyl, -til]
See more synonyms for infantile on Thesaurus.com
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).
Show More

Origin of infantile

From the Latin word infantīlis, dating back to 1690–1700. See infant, -ile
Related formsin·fan·til·i·ty [in-fuh n-til-i-tee] /ˌɪn fənˈtɪl ɪ ti/, noun

Synonyms

See more synonyms for infantile on Thesaurus.com
1. puerile, immature, weak.

Synonym study

1. See childish.

Antonyms

1. adult, mature.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for infantile

Contemporary Examples

Historical Examples


British Dictionary definitions for infantile

infantile

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
Show More
Derived Formsinfantility (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

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.

Show More
Online Etymology Dictionary, © 2010 Douglas Harper

infantile in Medicine

infantile

(ĭnfən-tīl′, -tĭl)
adj.
  1. Of or relating to infants or infancy.
  2. Displaying or suggesting a lack of maturity; extremely childish.
Show More
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.