puerilism
noun
pu·er·il·ism
| \ ˈpyu̇(-ə)r-ə-ˌli-zəm
, ˈpyu̇(-ə)r-ˌī-\
, ˈpyu̇(-ə)r-ˌī-\
Definition of puerilism
: childish behavior especially as a symptom of mental illness
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