Infantilisms refer to a form of behavior characterized by someone acting in an immature or childlike manner. There are several synonyms for this word, including immaturity, childishness, naivety, childish behavior, puerility, and juvenility. Another synonym for infantilism is infantility, which refers to an individual's tendency to behave like an infant or a young child. This type of behavior can be seen in individuals who lack maturity, emotional control, and the ability to think and act responsibly. Infantilisms can cause disruptions in adult relationships, as others may perceive the behavior as annoying or inappropriate.