This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A state of arrested development in an adult, characterized by retention of infantile mentality, accompanied by stunted growth and sexual immaturity, and often by dwarfism.

n. Marked immaturity, as in behavior or character: "infantilism, which is the subtext of so much American cinema and culture” ( John Simon).

n. An infantile act or remark.

n. An emotional dependency on being treated as an infant.

n. A sexual dependency on the sight or feeling of diapers, or being diapered.

n. Arrested or retrogressive development; the persistence or recurrence in the adult of those characteristics which are normal, but transient, in the child.

n. infantile behavior in mature persons

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

"Japanese infantilism is so heavily sexualized it would make Americans ... well, hysterical."

misdeed    misbehaviour    misbehavior   

psychological infantilism   

infantilist   

cystocele    rectocele    pervasiveness    stomachache    tropism    ophthalmia    purpura    pleurisy    flatulence    vomit