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demented

Syllabification: (de·ment·ed)

Pronunciation: /diˈmentid/

Translate demented | into French | into German | into Italian | into Spanish

Definition of demented

adjective

suffering from dementia.
informal driven to behave irrationally due to anger, distress, or excitement:a demented, dangerous, and sadistic Mafioso

Derivatives

dementedly
dementedness

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'