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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