The difference between Childish and Fatuous
When used as adjectives, childish means of or suitable for a child, whereas fatuous means obnoxiously stupid, vacantly silly, content in one's foolishness.
check bellow for the other definitions of Childish and Fatuous
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Childish as an adjective:
Of or suitable for a child.
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Childish as an adjective:
Behaving immaturely.
Examples:
"Your childish temper tantrums are not going to change my decision on this matter."
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Fatuous as an adjective:
Obnoxiously stupid, vacantly silly, content in one's foolishness.