[dɪˈmɛntɪd], (Adjective)

Definitions:
- behaving wildly and irrationally on account of anger, distress, or excitement
(e.g: she was demented with worry)

- affected with dementia


Phrases:

Origin:
mid 17th century: past participle of earlier dement ‘drive mad’, from Old French dementer or late Latin dementare, from demens ‘out of one's mind’