ˈinfən.təˌlizəm sometimes ə̇nˈfant ə lˌi- noun
( -s )
Etymology: International Scientific Vocabulary infantile + -ism
1. : a condition of being abnormally childlike : a retention of childish physical, mental, or emotional qualities in adult life ; especially : failure to attain sexual maturity
2. : an act or expression characteristic of lack of maturity : puerility
infantilisms of thought
the infantilism of selfishness — Agnes E. Meyer