Dictionary.com
definitions

infantile

[ in-fuhn-tahyl, -til ]
/ ˈɪn fənˌtaɪl, -tɪl /
||
SEE MORE SYNONYMS FOR infantile ON THESAURUS.COM

adjective

characteristic of or befitting an infant; babyish; childish: infantile behavior.
of or relating to infants or infancy: infantile diseases.
Physical Geography. youthful(def 5).

RELATED WORDS

childish, sophomoric, immature, juvenile, youthful

Nearby words

  1. infant prodigy,
  2. infant school,
  3. infanta,
  4. infante,
  5. infanticide,
  6. infantile acropustulosis,
  7. infantile autism,
  8. infantile cortical hyperostosis,
  9. infantile digital fibromatosis,
  10. infantile eczema

Origin of infantile

From the Latin word infantīlis, dating back to 1690–1700. See infant, -ile
ANTONYMS FOR infantile
1. adult, mature.
SEE MORE ANTONYMS FOR infantile ON THESAURUS.COM
Related formsin·fan·til·i·ty [in-fuhn-til-i-tee] /ˌɪn fənˈtɪl ɪ ti/, noun

Synonym study

1. See childish.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for infantile

British Dictionary definitions for infantile

infantile

/ (ˈɪnfənˌtaɪl) /

adjective

like a child in action or behaviour; childishly immature; puerile
of, relating to, or characteristic of infants or infancy
in an early stage of development
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

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
Medicine definitions for infantile

infantile

[ ĭn′fən-tīl′, -tĭl ]

adj.

Of or relating to infants or infancy.
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.