资料来源 : Webster's Revised Unabridged Dictionary (1913)

Demented \De*ment"ed\, a. [From {Dement}.]
   Insane; mad; of unsound mind. -- {De*ment"ed*ness}, n.

资料来源 : WordNet®

dementedness
     n : mental deterioration of organic or functional origin [syn: {dementia}]