Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or relating to infants or infancy.
  • adj. Displaying or suggesting a lack of maturity; childish: infantile behavior; an infantile remark.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Pertaining to infants.
  • adj. Childish; immature.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to infancy, or to an infant; similar to, or characteristic of, an infant; childish.

from The Century Dictionary and Cyclopedia

  • Of or belonging to infants or little children; pertaining to or characteristic of infancy or an infant.
  • Of the character of an infant; infant-like.
  • In geology, of a land form, having been subjected to the processes of erosion, in its present relation to base-level, for a very short lime.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. indicating a lack of maturity
  • adj. of or relating to infants or infancy
  • adj. being or befitting or characteristic of an infant

Etymologies

Middle English infantil, from Latin īnfantīlis, from īnfāns, īnfant-, infant; see infant.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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