Also found in: Thesaurus, Medical, Legal, Encyclopedia, Wikipedia.


(ĭn′fən-tl-ĭz′əm, ĭn-făn′tl-)
1. The existence of juvenile physical or psychological characteristics in an adult, as from failure to develop secondary sexual characteristics.
a. Marked immaturity, as in behavior or character.
b. An infantile act or remark.
3. A condition in which one desires to act or be treated like a baby, sometimes associated with a paraphilia.


1. (Psychology) psychol
a. a condition in which an older child or adult is mentally or physically undeveloped
b. isolated instances of infantile behaviour in mature persons
2. childish speech; baby talk


(ˈɪn fən tlˌɪz əm, -taɪˌlɪz-, ɪnˈfæn tlˌɪz əm)

1. the persistence in an adult of markedly childish anatomical, physiological, or psychological characteristics.
2. an infantile act, trait, etc.


the condition of one who is not a child acting abnormally childlike. — infantility, n.infantilistic, adj.
See also: Psychology
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.infantilism - an abnormal condition in which an older child or adult retains infantile characteristics
abnormalcy, abnormality - an abnormal physical condition resulting from defective genes or developmental deficiencies
ateleiosis, ateliosis - a form of infantilism characterized by physical underdevelopment but normal intelligence
2.infantilism - infantile behavior in mature persons
misbehavior, misbehaviour, misdeed - improper or wicked or immoral behavior


[ɪnˈfæntɪˌlɪzəm] Ninfantilismo m


n. infantilismo, manifestación de características infantiles en la edad adulta.
Inmadurez extrema.
References in periodicals archive ?
A popular shitpost image has a cute animal (talking animals, cartoons, and infantilism in general play a huge role in meme-making) asking his friend, "Why are you shitposting?
We made a diagnosis of Swyer's syndrome for this patient because she was a normal statured girl with primary amenorrhea, with clinical features of sexual infantilism, whose genotype was pure XY.
porcellus when used as experimental models may be useful in those studies on sexual infantilism in women, polycystic ovary syndrome, ambiguous genitalia at birth, pseudohermaphroditism, female genital virilization (Nobrega et al.
While it is tempting to define the Hipster as infantile in psychiatric terms, Bird maintains that "the style of his infantilism is a sign of the times, [and] he does not try to enforce his will on others, Napoleon-fashion, but contents himself with a magical omnipotence never disproved because never tested.
impose their own infantilism on our institutions, educational methods and doctrines.
By deifying Tagore and Ray, Bengalis have incarcerated the two artists in a prison- house of infantilism.
Surely, it was the double demands of his life, the curiosity for company, the furious clowning, the infantilism, the immediate and instant affection (exactly the stuff that can irritate quieter more diligent writers and critics), that fuelled his most vivid verse.
Macedonia seems like experimental laboratory, to prove how long a country would persist based on Macedonian political infantilism and on Albanian political ignorance.
It has dramatized environmentalism's descent into infantilism.
but whose ear-splitting shrieks and squeals are a dead giveaway that she hasn't a clue about the inherently selfish infantilism that makes girls like Olive so devastatingly sexy to powerful old guys with pots of money.