Demented
来自Big Physics
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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’.
wiktionary
Past participle of dement, from Latin dēmentāre.
etymonline
demented (adj.)
"having lost the normal use of reason, afflicted with dementia," 1640s, from obsolete dement "drive mad." Related: Dementedness.