de ‧ men ‧ ted /dɪˈmentəd, dɪˈmentɪd/ BrE AmE adjective
[ Date: 1600-1700 ; Origin: dement 'to drive mad' (16-19 centuries) , from Latin mens 'mind' ]
1 . crazy or behaving in a very strange way:
She was almost demented with grief.
2 . old-fashioned suffering from dementia