infantilism
noun
in·fan·til·ism
in-ˈfan-tə-ˌli-zəm
ˈin-fən-tə-ˌli-
-fən-ˌtī-ˌli-
1
: retention of childish physical, mental, or emotional qualities in adult life
especially
: failure to attain sexual maturity
2
: an act or expression that indicates lack of maturity
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Merriam-Webster unabridged
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