Sub-normality is a term that refers to the condition of being below the average level of intellectual functioning. This term is often used in the context of mental health and is sometimes considered insensitive. As such, there are many synonyms for sub-normality that can be used in a more neutral and respectful way. Alternative terms for this condition include cognitive impairment, developmental disability, learning disability, intellectual disability, and mental retardation. These terms recognize that individuals with this condition may have unique needs and challenges and should be treated with dignity and respect. It's essential to use appropriate language when discussing sub-normality to avoid stigmatizing individuals with this condition.