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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.

Can a power of attorney be rescinded after two doctors say someone is mentally incompetent?

From MarketWatch • Feb. 24, 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

It was unlikely Jeremy would ever stand trial after a court declared him mentally incompetent in January because of symptoms related to “severe dementia,” but Evans said Friday’s news felt like a final knife twist.

From Los Angeles Times • Nov. 28, 2023

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

From "Americanized" by Sara Saedi