Meaning

noun an abnormal condition in which an older child or adult retains infantile characteristics

noun infantile behavior in mature persons

originEtymology tree English infantile Proto-Indo-European *-id- Proto-Indo-European *-yéti Proto-Indo-European *-idyéti Proto-Hellenic *-íďďō Ancient Greek -ῐ́ζω (-ĭ́zō) Proto-Indo-European *-mos Proto-Indo-European *-mós Ancient Greek -μός (-mós) Ancient Greek -ισμός (-ismós)der. English -ism English infantilism From infantile + -ism.

Etymology from Wiktionary, CC BY-SA 3.0