We've found 4 phrases for childish (0.116 seconds):

act one's age »    To be mature and not childish.

boys and their toys »    Used to evoke the idea that adult men sometimes dote excessively on machines, automobiles, and gadgets in a childish manner.

play around »    To behave in a silly, or childish, or irresponsible way.

spit the dummy »    To a situation childishly, in an angry or frustrated manner.

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