Dement
Dement , transitive verb
[Latin dementare, from demens, -mentis, out of one's mind, mad; de + mens mind. See Mental, and compare Dementate.]
To deprive of reason; to make mad. [Rare] — Bale
Dement , adjective
[Latin demens, - mentis.]
Demented; dementate. [Rare] — J. H. Newman