only 1 use
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suffering from cognitive dementia (mental deterioration)
- Luminous these were too, beautiful and yet horrible of shape, like the demented forms in an uneasy dream; and they gave forth a faint sickening charnel-smell; an odour of rottenness filled the air.4.8 -- Book 4 Chapter 8 -- The Stairs of Cirith Ungol (8% in)
There are no more uses of "demented" in The Two Towers.
Typical Usage (best examples)