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mentally incompetent

ADJECTIVE

non compos mentis

Synonyms

WEAK

deprived of one's wits insane lunatic non compos not of sound mind unbalanced unsound

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

After my relative was declared mentally incompetent by two doctors, the lawyer activated the POA and is now preparing to place my relative in assisted living, which they do not want.

From MarketWatch • Mar. 3, 2026

Will, rather than being deprived, simply had very particular rules about what he would eat, and whether or not his diet was killing him didn’t necessarily mean he was mentally incompetent.

From The Wall Street Journal • Feb. 17, 2026

Mike Jeffries was declared "mentally incompetent" by a court in May and said to be suffering with dementia and late onset of Alzheimer's disease.

From BBC • Dec. 11, 2025

In advance of his trial, Girardi’s defense attorneys had contended that their client was mentally incompetent and suffered from a form of dementia.

From Los Angeles Times • Dec. 20, 2024

And yet my parents thought I was mentally incompetent for buying clothes at Goodwill.

From "Americanized" by Sara Saedi