1ADJ-GRADED 精神错乱的;（尤指）患早老性痴呆的 Someone who is demented has a severe mental illness, especially Alzheimer's disease. 精神错乱的;（尤指）患早老性痴呆的 [medicine, old-fashioned]
At what point does it become necessary to place a demented person in a nursing home?
到了什么时候算是有必要把早老性痴呆病人送到养老院去？
2ADJ-GRADED 古怪的;愚蠢的;疯狂的 If you describe someone as demented, you think that their actions are strange, foolish, or uncontrolled. 古怪的;愚蠢的;疯狂的 [informal, disapproval]
He had been granted his own TV show by some demented executive.