childish

Etymology

From Middle English childisch, from Old English ċildisċ. Equivalent to child + -ish.

adj

  1. Of or suitable for a child.
    She remembered, too, when, after a long childish illness, her father had carried her in his arms to the garden, […] 1824, Susan Ferrier, The Inheritance, page 130
  2. Immature in thought or behaviour.
    Your childish temper tantrums are not going to change my decision on this matter.

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