The term "moron" originally referred to a specific classification of intellectual disability in the early 20th century, defined as having an IQ between 51 and 70. It was used in psychological contexts to describe individuals with mild cognitive impairments. Over time, the term has fallen out of favor in professional settings due to its derogatory connotations and the evolution of more respectful language. Today, "moron" is often used informally to describe someone perceived as foolish or lacking common sense. This usage is generally considered offensive and can perpetuate stigma against individuals with intellectual disabilities, such as those classified under the DSM-5 (Diagnostic and Statistical Manual of Mental Disorders).