Table of Contents POS
HYPHEN
WORDNET DICTIONARY
OXFORD DICTIONARY
THESAURUS

WORDNET DICTIONARY

Noun infantilism has 2 senses

• infantilism(n = noun.state) Array - an abnormal condition in which an older child or adult retains infantile characteristics; Array
is a kind of abnormalcy, abnormality
has particulars: ateleiosis, ateliosis

• infantilism(n = noun.act) Array - infantile behavior in mature persons; Array
is a kind of misbehavior, misbehaviour, misdeed

OXFORD DICTIONARY

THESAURUS

infantilism

amentia, arrested development, babyishness, backwardness, blithering idiocy, childishness, cretinism, half-wittedness, idiocy, idiotism, imbecility, immaturity, insanity, mental defectiveness, mental deficiency, mental handicap, mental retardation, mongolianism, mongolism, mongoloid idiocy, moronism, moronity, profound idiocy, puerilism, puerility, retardation, retardment, simple-wittedness, simplemindedness, simpleness, simplicity, subnormality

For further exploring for "infantilism" in Webster Dictionary Online