What is the mental illness called "arrested development"?

Answer 1

If you think of a man or woman as going through childhood, youth, and adulthood, people who do not advance beyond childhood or youth in their grown-up years may be said to suffer from arrested development. Literature calls attention to this: the desire to be in a never-never-land where time stops and no child grows older: the Peter Pan syndrome, where it is a charming fantasy. In Tennesee Williams' "Glass Menagerie" there is a disturbed yet moving character who treasures glass animals as a child might. Some graduates of British public (private) schools are supposed to be "perpetual adolescents" because their school was the high point of their life and they never get over it. Of course all of us preserve aspects of childhood and adolescence in our personalities but a person suffering from arrested development goes much further: he/she is frozen at an earlier point in their lives. This could mean that they are not at all interested in mature relationships. A man could relate to a woman not like an adult partner but like a child to its mother. Or they could go through a series of temporary enthusiasms in the manner of an adolescent or be turned on only by those things they were introduced to in childhood and by nothing else. In Sophocles' "Oedipus the King" the riddle of the Sphinx is this: What goes on four feet (child), two feet (man), three feet (an old man with a stick), and is yet one thing? The answer: Man.

Answer 2

It is psycological gibberish for being a slow, dumb-assed,lazy person.