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infantilism

in·fan·ti·lism

infantilism

 
pronunciation:
In fn t lih zm [or] In fn taI lih zm [or] ihn faen t lih zm
part of speech: noun
definition 1: an abnormal condition of an adult marked by the persistence of immature mental and physical development and behavior, including lack of sexual maturation.
definition 2: an instance of or tendency toward childish behavior.