infantile

Infantile means immature or childish. Thumb-sucking and temper tantrums are examples of infantile behavior.

Doctors use the word infantile just like you'd expect: to describe things having to do with infants or babies. The rest of us, though, generally use this adjective when someone's being a brat or a crybaby or otherwise behaving immaturely. If someone refers to your sense of humor or your style of argument as "infantile" they are not offering you a compliment. They might be trying to tell you to "grow up."

Definitions of infantile
  1. adjective
    of or relating to infants or infancy
    infantile paralysis”
  2. adjective
    being or befitting or characteristic of an infant
    infantile games”
    Synonyms:
    immature, young
    (used of living things especially persons) in an early period of life or development or growth
  3. adjective
    indicating a lack of maturity
    infantile behavior”
    synonyms: childish
    immature
    characteristic of a lack of maturity
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