puerilism

noun
pu·​er·​il·​ism | \ˈpyu̇(-ə)r-ə-ˌli-zəm, ˈpyu̇(-ə)r-ˌī-\

Definition of puerilism 

: childish behavior especially as a symptom of mental illness

First Known Use of puerilism

1924, in the meaning defined above

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The first known use of puerilism was in 1924

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playful or foolish behavior

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