Main Entry: in·fan·til·ism

Pronunciation: \ˈin-fən-ˌtīl-ˌiz-əm, -tə-ˌliz-; in-ˈfan-t^əl-ˌiz-\

Function: noun

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