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demented

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The definition of demented is an insane person or someone with a loss of mental function.

(adjective)

An example of demented is the character Dr. Frankenstein from the novel Frankenstein by Mary Shelley.

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See demented in Webster's New World College Dictionary

adjective

mentally deranged; insane; mad

Origin: pp. of dement

Related Forms:

dementedly adverb

See demented in American Heritage Dictionary 4

adjective

Mentally ill; insane.
Suffering from dementia or a loss of cognitive function.

Related Forms:

de·mentˈed·ly adverb

de·mentˈed·ness noun

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