Intellectual disability (ID), also known as general learning disability in the United Kingdom[3] and formerly mental retardation,[4][5] is a generalized neurodevelopmental disorder characterized by significantly impaired intellectual and adaptive functioning. It is defined by an IQ under 70, in addition to deficits in two or more adaptive behaviors that affect everyday, general living.

I'm saying they are intellectually deficit compared even to the average adult. Would you be happier if I called them illectually disabled? Dunno what that even changes.