infantile

Adjective
  1. Indicating a lack of maturity (synset 301496164)
    "childish tantrums"; "infantile behavior"
    similar to: immature - characteristic of a lack of maturity
    same as: childish
  2. Of or relating to infants or infancy (synset 302759609)
    "infantile paralysis"
  3. Being or befitting or characteristic of an infant (synset 301652631)
    "infantile games"
    similar to: immature, young - (used of living things especially persons) in an early period of life or development or growth

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