infantile

Etymology

Mid-15th century, "pertaining to infants," from Latin infantilis (“pertaining to an infant”), from īnfāns. Sense of "infant-like" is from 1772.

adj

  1. Pertaining to infants.
    infantile paralysis
    Eustace gaped at him in amazement. When his urbanity dropped away from him, as now, he had an innocence of expression which was almost infantile. It was as if the world had never touched him at all. 1963, Margery Allingham, chapter 9, in The China Governess
  2. Childish; immature.

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