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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.

The 81-year-old had previously been found mentally incompetent last May but prison officials then declared in December that he was fit for trial following his hospital stay.

From BBC • Mar. 28, 2026

I am getting the impression that once a couple of doctors sign off that you are mentally incompetent, you lose all control.

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

His attorneys have long sought to portray Girardi as mentally incompetent and in the throes of progressive cognitive decline, but a federal judge this year deemed him fit to stand trial.

From Los Angeles Times • Aug. 22, 2024

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

From "Americanized" by Sara Saedi