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demented

de·ment·ed [ di méntəd ]


adjective 
Definition:
 
1. entirely irrational: completely unreasonable or lacking any sense of the consequences of actions taken ( informal )

2. affected with dementia: affected by the loss of intellectual functions that is associated with dementia

[Mid-17th century. Past participle of obsolete dement "deprive of reason" < Latin dementare< ment- "mind"]

de·ment·ed·ly adverb
de·ment·ed·ness noun
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