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).


  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

mid-15c., “pertaining to infants,” from Latin infantilis “pertaining to an infant,” from infans (see infant). Sense of “infant-like” is from 1772.


  1. Of or relating to infants or infancy.
  2. Displaying or suggesting a lack of maturity; extremely childish.

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