subnormal

Indicates a significant degree of being subnormal.

Refers to individuals with below-average intellectual functioning.

A former term for people with learning difficulties that affect their education.

To be in a state of having intelligence or development below the typical range. This term is dated and often considered offensive.

To behave towards someone as if they have subnormal intelligence.

To officially label someone as having subnormal intelligence, often in a medical or educational context.