infantilism


in·fan·til·ism

noun
\ˈin-fən-ˌtīl-ˌiz-əm, -tə-ˌliz-; in-ˈfan-təl-ˌiz-\

Definition of INFANTILISM

: retention of childish physical, mental, or emotional qualities in adult life; especially : failure to attain sexual maturity

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