The difference between Demented and Mentally ill
When used as adjectives, demented means insane or mentally ill, whereas mentally ill means having a psychological disorder.
check bellow for the other definitions of Demented and Mentally ill
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Demented as an adjective:
Insane or mentally ill.
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Demented as an adjective:
Suffering from dementia.
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Demented as an adjective (informal):
Crazy; ridiculous.
Examples:
"a demented idea"
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Demented as a verb:
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Mentally ill as an adjective:
Having a psychological disorder.