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demented

/dɪˈmɛntɪd/ adjective C1
  1. Insane; mentally ill.
  2. Having dementia.
  3. Crazy; ridiculous. (informal) · a demented idea
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From the library

The husband is half demented.
The Case-Book of Sherlock Holmes, p. 54 · B2
The lake there is eight feet deep, and you can imagine our feelings when we saw that the trail of the poor demented girl came to an end at the edge of it.
The Memoirs of Sherlock Holmes, p. 13 · B2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.