Intellectual disability

Intellectual disability is a mental illness that impairs a person's intellect, by retarding one's learning abilities.

In the past, the word idiot was used to describe a person with such a disability, although such words are considered derogatory in modern times and are more often used as insults.

The Scarecrow once called one of his Strawmen and idiot, when telling him that he could tell that Batman was afraid of Crime Alley.

People who suffer from intellectual disabilities

 * Twisty
 * Solomon Grundy
 * Shaggy Man
 * Bizarro