Amentia vs. Dementia — What's the Difference?

Severe intellectual disability. This term belongs to a classification system no longer in use.

Dementia manifests as a set of related symptoms, which usually surface when the brain is damaged by injury or disease. The symptoms involve progressive impairments to memory, thinking, and behavior, which negatively impact a person's ability to function and carry out everyday activities.

Mental impairment; state of being mentally handicapped.

Loss of cognitive abilities, including memory, concentration, communication, planning, and abstract thinking, resulting from brain injury or from a disease such as Alzheimer's disease or Parkinson's disease. It is sometimes accompanied by emotional disturbance and personality changes.

Imbecility; total lack of understanding.

(pathology) A progressive decline in cognitive function due to damage or disease in the brain beyond what might be expected from normal aging. Areas particularly affected include memory, attention, judgement, language and problem solving.

Extreme mental retardation

Madness or insanity.

Insanity; madness; esp. that form which consists in weakness or total loss of thought and reason; mental imbecility; idiocy.

Mental deterioration of organic or functional origin