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DictionaryRoot: mens
Latin

mens

mind

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A man wildly attacks his own upholstered armchair with garden shears, cutting into the cushions as stuffing flies, while a startled bystander recoils.
adjective

demented

di-MEN-tid/dɪˈmentɪd/

Mentally disturbed or wildly irrational.

Etymology
deLatinaway from
+mentLatinmind
+edEnglishhaving a feature or being in a resulting state

Being 'away from one's mind' supplies the image of losing ordinary reason. From obsolete dement, 'drive mad,' probably borrowed from French, the adjective describes someone acting wildly or irrationally.

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