demented - Dictionary definition and meaning for word demented
de + MENT + ed..focus on the bold letters ment(MENTAL).....SO A MENTAL PERSON IS AN INSANE PERSON.
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remember the DEMENTORS? in harry potter?? they are pretty INSANE...
d(demaag .. brain) + mental( mai cement )
de+mented...sounds like de+minted when ever i dont get mint i go insane
he became the(de) mental(mented) guy