Dementia

n.

1.

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

Noun

1.

dementia - mental deterioration of organic or functional origin Synonyms: dementedness

aberration, abnormality, alienation, brain damage, brainsickness, clouded mind, craziness, daftness, dementedness, derangement, disorientation, distraction, folie, furor, insaneness, insanity, irrationality, loss of mind, loss of reason, lunacy, madness, mania, mental deficiency, mental derangement, mental disease, mental disorder, mental disturbance, mental illness, mental instability, mental sickness, mind overthrown, mindsickness, oddness, pixilation, possession, queerness, rabidness, reasonlessness, senselessness, shattered mind, sick mind, sickness, strangeness, unbalance, unbalanced mind, unsaneness, unsound mind, unsoundness, unsoundness of mind, witlessness