dement

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dement

(dĭ-mĕnt′)
tr.v. de·mented, de·menting, de·ments
1. To cause (a person) to become mentally deranged.
2. To cause (a person) to lose intellectual capacity.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
References in classic literature ?
The lake there is eight feet deep, and you can imagine our feelings when we saw that the trail of the poor demented girl came to an end at the edge of it.
George, who has been looking first at one of them and then at the other, as if he were demented, takes his venerable acquaintance by the throat on receiving this request, and dragging him upright in his chalr as easily as if he were a doll, appears in two minds whether or no to shake all future power of cushioning out of him and shake him into his grave.
Mother has been almost demented ever since father died--she's an old woman.
That might explain his change of countenance, and it was just possible that her demented influence still hung about Holmescroft; but the rest was beyond me.
I dug eagerly, and now and then caught myself actually looking, with something that very much resembled expectation, for the fancied treasure, the vision of which had demented my unfortunate companion.