/dɪˈmentɪd/
de·men·ted
BrE /dɪˈmentɪd/
NAmE /dɪˈmentɪd/
(especially BrE)
behaving in a crazy way because you are extremely upset or worried
I’ve been nearly demented with worry about you.
(old-fashioned or medical)
having a mental illness
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de·men·ted·ly
BrE /dɪˈmentɪdli/
NAmE /dɪˈmentɪdli/