1. Plural of infantilism; childish or immature behavior, speech, or characteristics in an older person or in contexts where maturity is expected.
Usage: Usually used in the plural or as a mass noun; Can refer to linguistic features (baby talk) or behavioral patterns
2. In psychology and medicine, a condition in which an individual retains or reverts to infantile characteristics, speech patterns, or behaviors.
Usage: technical/medical usage

Examples

• The teenager's infantilisms—such as baby talk and constant whining—annoyed his parents.
• Linguists study infantilisms in language development to understand how children acquire speech patterns.
• His infantilisms became more pronounced after the stressful event, suggesting emotional regression.
• The film satirized the infantilisms of adult characters who refused to grow up.
• Teachers often encounter infantilisms in students who seek attention through immature behavior.
• Psychologists noted that the patient's infantilisms decreased after therapy began.