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Childish (adjective)
Of or suitable for a child.
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Childish (adjective)
Behaving immaturely.
“Your childish temper tantrums are not going to change my decision on this matter.”
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Childlike (adjective)
Innocent and trustful; credulous; artless.
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Childlike (adjective)
Of, like, or suitable for a child.
“childish|childly”
Wiktionary